American PowerTrain FAQ

  1. Shipping
    1. Check All Shipments Before You Sign For Them
    2. Claims
    3. Refused Orders
    4. Shortages
    5. Carriers
    6. Domestic Orders (USA, Canada & Mexico)
    7. International Shipping
  2. Privacy
    1. Communications
    2. Brochure Mailing List
    3. Communications to Serve You
    4. Fraud Protection and Compliance with Law
    5. Service Providers
    6. Special Events
    7. Business Transfers
    8. Cookies, IP Addresses, Pixel Tags and Tracking Technology
    9. Use of Aggregate Information
    10. Links
    11. Security
    12. Notification of Policy Changes
    13. Updating Personal Information
    14. Contacting Us
  3. Terms of Sale
    1. Warranties
    2. Disclaimer
    3. Pricing
    4. Return Policy
    5. The following Parts are Not Returnable
    6. Special Order Items
    7. Core Returns
    8. Refused Orders
    9. Back Orders
    10. Damage/Claims/Shipping/Shortages
  4. Help Center
  5. FAQ
    1. What fluid should I use and how much?
    2. What are the components of a TKO 5 speed?
    3. What are the components of a Magnum 6 speed?
    4. How long is the break-in period?
    5. How do I measure for my custom driveshaft and when can I expect to receive it?
    6. How do I calculate the driveline angle?
    7. What is the difference between internally and externally balanced engines?
    8. How often should I change my fluid?
    9. What is the best way to shift quickly/smoothly into 3rd gear with a White Lightning Shifter?
    10. Can I use mechanical linkage with my new Tremec Transmission?
    11. How do I set up my Hydramax to get smooth, light pedal effort?
    12. What would cause my clutch to have a short engagement/disengagement?
    13. What fluid should I use in the master cylinder with my Hydramax system?
    14. How do I dial indicate my Bellhousing?

Shipping

Q: Check All Shipments Before You Sign For Them

Please inspect your order upon receipt. Check contents in the presence of the carrier. Should your order arrive damaged or with parts broken or missing, first contact the shipping company and then contact your salesperson so that we can help correct the problem.

Q: Claims

Should your order arrive in a damaged condition, check contents in the presence of the carrier. Claims for shortage or error in shipment must be made within 10 days of receipt of goods. Claims for damage or loss in transit must be made by the consignee directly with carrier.

Q: Refused Orders

Freight charges, both ways plus a 15% restocking fee will be charged on any refused shipments for any unauthorized reason.

Q: Shortages

If items are missing from your order, please notify your salesperson within 10 days of receipt.

Q: Carriers

We ship worldwide via UPS, FedEx, Bax Global, DHL, Truck, Air Freight, and Sea Freight. Orders are shipped via ground freight unless another method is specified at time of order.

Q: Domestic Orders (USA, Canada & Mexico)

Shipping costs will be added to every order when the order is processed. As a rule of thumb, shipping for 5-speed transmission orders costs $125 to US locations east of the Mississippi River, and $145 to US locations west of the Mississippi River. (Auto to Manual swaps will be higher)

Q: International Shipping

Overseas Orders: All taxes, duties and customs fees are the responsibility of the customer.

International customers can save up to 82% off typical international shipping rates by following these four easy steps:

  1. Register with Bongo and receive a U.S. shipping address.
  2. Enter the Bongo address as both your billing and shipping address.
  3. Use the credit card that you have on file with Bongo as the payment method.
  4. Once the order arrives at Bongo, log into your account to forward to your country.

Bongo International provides our customers with their very own US address. Once you have a US address, you will be able to make purchases with us as well as other US based online retailers. Bongo receives your purchases and logs them into their online system which you can use to view your items and consolidate them with multiple orders.

If you have any questions, please feel free to contact Bongo through live chat or by e-mail. They will be glad to assist you.

Notice to our customers: At this time, we view BongoUS as being advantageous to both our customers as well as our companies.

Due to Bongo's procedures in fraud detection, their services to us are advantageous. They will take additional steps with you such as depositing a small amount into your bank account or onto your credit card account and you'll confirm that amount with them before they will ship. They also help you with estimating your shipping costs, and of course, you can run your own calculations on Fedex.com, etc. Any extra steps taken with your checkout procedures lets BongoUS and us know that you do have access to your account and that your credit card is authentic.

We may implement BongoUS as our only International shipping service in the near future, but would like your feedback on whether this would prevent you from purchasing from us or if you view Bongo's combined shipping, and the lower Shipping Rates as being an asset to you as well.

Our webmaster will be collecting your comments for our perusal. Please use our contact form for your comments. Being specific will help us with this decision. Thanks so much.


Privacy

Q: Communications

If you select during the order process or at other times when you submit personally identifiable information, the information you provide may be used by American PowerTrain to create and deliver to you our newsletters, surveys or other communications containing product information. If you prefer not to receive such Communications, please do not select the ‘Please inform me option’. If you do select this option and later decide that you would no longer like to receive these communications, please use the features made available to you.

Q: Brochure Mailing List

If you have requested a American PowerTrain brochure, all information is kept completely confidential and is not shared with any third parties. We may, on occasion, send you an updated catalog or brochure. If you do not wish to receive any mail from American PowerTrain, please contact us via email at . Include your name and mailing address and email address. You will be removed from any future mailings.

Q: Communications to Serve You

If you have elected to provide us with your contact information, e.g., by registering at the Site, emailing our Customer Service department or placing an order, we may provide you with service related announcements concerning the Site or contact you regarding your customer service requests or your order. For example, all registered users will receive an email to confirm their order. These types of communications are necessary to serve you, respond to your concerns and to provide the high level of customer service that American PowerTrain offers its customers.

Disclosure of Personally Identifiable Information

We will never provide your personally identifiable information to third parties for their use in marketing their products or services to you without your consent. American PowerTrain takes great pride in having you as a customer and we will ensure your privacy as a customer. American PowerTrain does not sell or exchange names or any other information about our customers with third parties.

Q: Fraud Protection and Compliance with Law

We may disclose any information, including personally identifiable information, we deem necessary, in our sole discretion, to comply with any applicable law, regulation, legal process or governmental request. We may also exchange information, including personally identifiable information, with other companies and organizations for credit fraud protection and risk reduction.

Q: Service Providers

We may retain other companies and individuals to perform functions consistent with our Privacy Policy on our behalf. Examples include customer support specialists, web hosting companies, fulfillment companies (e.g., companies that fill product orders or coordinate mailings), data analysis firms and email service providers. Such third parties may be provided with access to personally identifiable information needed to perform their functions, but may not use such information for any other purpose.

Q: Special Events

If you elect to participate in any promotions, sweepstakes, surveys, questionnaires or other events during your visit to our Site, the rules or terms and conditions for those events may indicate that your personally identifiable information will be shared with third parties. By choosing to participate and submitting your personally identifiable information with respect to such events, you consent to disclosure of your personally identifiable information to such third parties.

Q: Business Transfers

As we continue to develop our business, we might sell certain of our assets. In such transactions, user information, including personally identifiable information, generally is one of the transferred business assets, and by submitting your personal information on the Site you agree that your data may be transferred to such parties in these circumstances.

Q: Cookies, IP Addresses, Pixel Tags and Tracking Technology

We may place a "cookie" on your computer's hard drive so we can recognize you as a return user and personalize your experience. A cookie is a piece of data that enables us to track and target your preferences. The cookie will be stored on your computer's hard drive until you remove it. We may also use temporary or "session" cookies to help you shop. These cookies will expire when you place an order. You can have your browser notify you of, or automatically reject, cookies. If you reject our cookies, you may still use the Site, but you may be limited in the use of some of the features. In addition, we may use IP addresses to analyze trends, administer the Site, track traffic patterns, and gather demographic information for aggregate use, as well as in combination with your personally identifiable information for credit fraud protection and risk reduction.

Similarly, when you visit this Site or view one of our emails, we may use pixel tags (also called "clear" gifs), tracking links and/or similar technology to note some of the pages you visit on our Site and personalize your experience. We may also use pixel tags to determine what types of email your browser supports. We may use the information collected through pixel tags, tracking links and similar technology in combination with your personally identifiable information.

YOUR DOMAIN NAME HERE does recognize your ISP (internet service provider), however, we cannot identify you as an individual. If you make an on-line purchase we do collect information (such as sales statistics and traffic patterns) to help improve your shopping experience. We keep all information confidential.

Q: Use of Aggregate Information

We may use the information you provide in aggregate (non-personally identifiable) form for internal business purposes, such as generating statistics and developing marketing plans. We may collect, store or accumulate certain non-personally identifiable information concerning your use of the Site, such as information regarding which of our pages are most popular. We may share or transfer non-personally identifiable information with or to our affiliates, licensees and partners.

Q: Links

This Privacy Policy applies only to the information collected on this Site. Our Site may contain links to or from other websites and you should be aware that we are not responsible for the privacy practices of other websites. We encourage you to read the privacy policies of other websites linked to the Site.

Q: Security

American PowerTrain seeks to protect the security of your personal information both online and offline. All credit card transactions are secure. Every on-line order is encrypted and sent through a secure server, using SSL technology to prevent information from being intercepted.

Confidential information such as your credit card number will be used only to fulfill your order. To protect your privacy, we will ask you to enter your credit card number and expiration date each time you place an order with us. This way, even if someone else accesses the account information stored on your computer, they won't be able to use your credit card.

E-mail is not encrypted and is not a secure means to transmit credit card numbers. We will only display the last 4 digits of your credit card number on your account.

Q: Notification of Policy Changes

American PowerTrain reserves the right to revise this Privacy Policy in the future by posting changes at this location and we may make changes at any time without notification.

Q: Updating Personal Information

If you are a registered member at American PowerTrain, you can change your personal information at any time by updating your information at check-out.

Q: Contacting Us

We welcome your comments and questions about privacy. Please send email to sales@americanpowertrain.com.

We are confident that your visit to American PowerTrain is secure and safe. However, you may choose to call us directly to place your order over the telephone. Please call Customer Service toll free at 931-646-4836.


Terms of Sale

Q: Warranties

All parts sold by us are warranted against defects in material and workmanship either by the original manufacturer or by American Powertrain for the specified term. This warranty does not cover installation or consequential labor, failure resulting from improper installation, failure of a related component, or failure resulting from abuse or commercial or racing usage. Our liability is limited to the cost of the original component.

We reserve the right to replace or repair defective merchandise, or refund the purchase price, at our discretion.

Q: Disclaimer

We make every effort to supply you with original parts, when obtainable, at a reasonable price. Items that are obsolete will be the highest quality reproductions that we can supply. If you have any questions, please ask your sales person.

Q: Pricing

Prices are subject to change without prior notice.

Q: Return Policy

All Returned Parts must have a Return Authorization Number (RA #) clearly marked on the outside of the box and must be shipped pre-paid in original condition. Obtain this Return Authorization Number from your salesperson before returning any parts to us. You must include the Return Authorization Number with the returned part, in order to receive proper credit for the returned merchandise. No collect shipments will be accepted. Please insure the returned parts for full value to protect yourself against loss. All truck freight returns must be authorized in advance.

Returned Parts may be subject to a 20% restocking fee.

Unauthorized returns (i.e. returns not having an RA#) will be refused.

We will not accept any returns after thirty (30) days from date of purchase.

Q: The following Parts are Not Returnable

  • Used Parts. All used part sales are final.
  • Electrical Parts.
  • Special Order Parts.
  • Any Parts which have been installed, marked, plugged-in, etc.
  • Workshop Manuals.

Q: Special Order Items

Special Order items require a 50% non-refundable deposit. There will be a 20% charge on any cancellation of all Special Order items, including transmission products.

Q: Core Returns

Cores for rebuilt parts must be returned in original boxes. All cores must be complete, drained, fully assembled, and without damage to receive full core credit. Adjustments will be made for cores that are incomplete, incorrect, damaged, or in non-repairable condition. Orders which include a core charge will have an RA # included in the enclosed paperwork.

Please allow thirty (30)days from the date we receive your core to process your credit.

There will be a core charge on all rebuilt items--No Exceptions! This is necessary to insure core returns. A copy of the original invoice must accompany all returned cores. Core charges will be credited or refunded only after it has been determined that the core is complete and is rebuildable. Any defective core will be credited accordingly.

Q: Refused Orders

Freight charges, both ways plus a 20% restocking fee will be charged on any refused shipments for any unauthorized reason.

Q: Back Orders

If there is to be any delay in filling your order, you will be notified. Back Orders will be held for 60 days. All Back Orders will be shipped within 60 days or cancelled. If you do not want us to ship Back Orders, we must be notified immediately or you will be subject to our returns policy on merchandise returned.

Q: Damage/Claims/Shipping/Shortages

CHECK ALL SHIPMENTS BEFORE YOU SIGN FOR THEM

Should your order arrive in a damaged condition, check contents in the presence of the carrier. Claims for shortage or error in shipment must be made within 10 days of receipt of goods. Claims for damage or loss in transit must be made by the consignee directly with carrier.


FAQ

Q: What fluid should I use and how much?

Transmission fluid is the life blood of your transmission. Proper wear and synchronization depends on using correct fluid. DO NOT USE aftermarket fluid in this transmission. Use only GM Synchromesh (part# 12345349), Pennzoil Synchromesh or Mobil1 ATF. Any other fluid used may cause premature wear and grinding synchronizers and will VOID YOUR WARRANTY.

NOTE: You can use standard Dexron III ATF for break-in, but it must be drained after the break-in period and replaced with Synchromesh or Mobil1 ATF as your permanent fluid.
Filling Transmission Case:
  1. If you removed the rubber bung from the tailhousing during test fitting, replace before filling transmission or, if available, install your driveshaft.
  2. Remove the square headed filler bolt located on the side of the main case about half-way up. (lower hole is the drain plug)
  3. Using a hand operated fluid pump, install 2 quarts of GM Synchromesh (part# 12345349) found at any GM dealership or Pennzoil Synchromesh (same stuff but cheaper) found at big box retailers like AutoZone. After 2 quarts, slowly add fluid until it reaches 1/8” from the bottom of the fill hole when transmission is level. You can easily test this by placing your small finger in the hole to the first knuckle. You should be able to feel the fluid by bending your finger.
  4. The TKO 500 & 600 Tremec transmissions require approximately 2.42 quarts. The 6 Speed Tremec Magnum transmissions require approximately 3.45 quarts.

  5. Replace the filler bolt.
  6. Store extra Synchromesh in an airtight container in a dry environment to prevent water absorption. Improperly stored fluid should be discarded.

Q: What are the components of a TKO 5 speed?

TKO 500 & 600
TKO 5 Speed
Components
  • Vent Tube
  • Spring Retention Bolt (Do Not Remove)
  • Mechanical Speedometer Port
  • Neutral Safety Switch
  • Electronic Speedometer Port
  • Fill Plug
  • Drain Plug

Q: What are the components of a Magnum 6 speed?

Magnum 6 Speed
Components
  • Reverse Lockout
  • Fill Plug
  • Drain Plug
  • Mechanical Speedometer
  • Vent Tube
  • Electronic Speedometer Port
  • Reverse Light

Q: How long is the break-in period?

Your new transmission has a 500 mile break-in period, during which the transmission should be operated rather gently to allow the synchronized gears to self-tolerate. After this break-in period, drain your transmission into a clean pan, check for abnormal particulate in the fluid, and refill using GM Synchromesh, Pennzoil Synchromesh, or Mobil 1 ATF.

NOTE: Some sloughing off of material is expected when performing the break-in fluid change. A magnet in the bottom of the transmission will trap ferrous particles, but it is normal for some aluminum and brass to be suspended in the fluid.

Q: How do I measure for my custom driveshaft and when can I expect to receive it?

The measurement is known as "seal to center" and is the distance between the case of the transmission next to the rear seal and the centerline of the pinion yoke. When ordering a driveshaft you must complete the following form. Email this completed form to support@americanpowertrain.com, or fax the form, front and back, to 480.393.4180. How to measure the driveshaft and determine your rear universal joint size is demonstrated on the form. For late model Mustangs, a second page is provided to determine your rear flange size. Turnaround time, once your form is submitted, is 24 to 48 hours to build along with the amount of time require to reach your location via FedEx Ground (1 to 5 days).

American Powertrain Driveshaft Order Form

Q: How do I calculate the driveline angle?

Finding your driveline angle is the easy part; deciding what angles work best for you, however, can be a challenge. Please review the following video for a demonstration of driveline angle affect. Driveline Angle Affect.

Simply put, an incorrect driveline angle can create vibration, cause premature universal joint failure, and reduces power to the rear wheels. Consider the following article from hotrod.com. How To Set Pinion Angle.

Tremec has created a free app for smart phones that measures the driveline angles and displays whether they are within specification. Below is a link to a PDF of the app's instructions as well as a link where the app can downloaded.

TREMEC Driveline Angle Finder App Instructions
Get The Tremec Driveline Angle Finder App

Q: What is the difference between internally and externally balanced engines?

Internally balance engines have weights added to the crankshaft counterweights to achieve proper balance in the rotating assembly. The rotating assembly consists of the crankshaft, connecting rods, pistons, and wrist pins. To achieve proper balance in the rotating assembly, externally balanced engines require the use of added weight to the flywheel/flexplate, or weight removed from one side of the flywheel. Below is an excellent article from hotrod.com to further explain internal and external balancing and why it is important to select the correct flywheel/flexplate for your engine.

How to Balance An Engine - Engine-Balancing Basics

Q: How often should I change my fluid?

According to Tremec:
"Maintenance Recommended oil change intervals should be based on specific usage. In most cases a “fill for life” is adequate, while in severe applications such as drag racing, or road racing a more frequent fluid change should be prescribed. Excessive heat will cause most fluids to breakdown and ultimately cause damage to the transmission."

Q: What is the best way to shift quickly/smoothly into 3rd gear with a White Lightning Shifter?

The White Lightning Shifter is a superior shifter in many ways. Occasionally, however, performance drivers struggle with the 2nd to 3rd gear up-shift. The issue arises when the "H" pattern, we all grew up with, is performed and 3rd gear is missed or feels "notchy". This can be especially prevalent when shifting quickly. Take a look at the following video and try performing the up-shift with an open palm. The White Lightning will move to a perfect 3rd gear alignment on its own.

Q: Can I use mechanical linkage with my new Tremec Transmission?

Yes! Consider, however, that you are installing a modern performance transmission and then attempting to actuate it with a combination of parts designed over 50 years ago. American Powertrain’s patented HYDRAMAX hydraulic systems and components are the most advanced systems on the market today. For more on the Hydramax system, please review the following video.

Q: How do I set up my Hydramax to get smooth, light pedal effort?

If your clutch pedal is hard to push, the first thing to check is for any binding in the linkage between your clutch pedal and the master cylinder. Secondly, check to make sure you have not created too steep of an angle in the actuation of the rod moving in and out of the master cylinder.

Next, verify your pedal ratio is within specification. The pedal ratio is the distance that your foot moves versus the distance the rod going in and out of the master cylinder moves. Pedal ratio is an important component in creating a smooth pedal feel with excellent clutch modulation. One of the biggest mistakes made in hydraulic conversions is creating a low pedal ratio.

Ideally, you want between 5:1 and to 6:1 ratio. This means essentially that if your master cylinder rod moves 1”, your foot needs to moves 5-6”. The Wilwood master cylinder supplied with our Hydramax kits require 1.12" of travel; this means that your pedal needs to move 6" to achieve a 5:1 ratio. Most stock pedal pivot points give an excellent pedal ratio, however if you move the rod lower on the pedal, or you are building a custom car and you have a ratio lower than 4:1, you may consider artificially raising the point at which the pedal rod hits the pedal arm to increase this ratio. If this is not possible, you can also consider moving the master cylinder bracket assembly lower on the firewall to increase the rod angle and therefore the pedal ratio.

Hydramax kits

Q: What would cause my clutch to have a short engagement/disengagement?

If your clutch engages or disengages too quickly, you may have an incorrect pedal ratio. The pedal ratio is the distance that your foot moves versus the distance the rod going in and out of the master cylinder moves. Pedal ratio is an important component in creating a smooth pedal feel with excellent clutch modulation. One of the biggest mistakes made in hydraulic conversions is creating a low pedal ratio.

Ideally, you want between 5:1 and to 6:1 ratio. This means essentially that if your master cylinder rod moves 1”, your foot needs to moves 5-6”. The Wilwood master cylinder supplied with our Hydramax kits require 1.12" of travel; this means that your pedal needs to move 6" to achieve a 5:1 ratio. Most stock pedal pivot points give an excellent pedal ratio, however if you move the rod lower on the pedal, or you are building a custom car and you have a ratio lower than 4:1, you may consider artificially raising the point at which the pedal rod hits the pedal arm to increase this ratio. If this is not possible, you can also consider moving the master cylinder bracket assembly lower on the firewall to increase the rod angle and therefore the pedal ratio.

Hydramax kits

Q: What fluid should I use in the master cylinder with my Hydramax system?

Use only DOT3 or DOT4 high temperature non-silicone brake fluid. Use of other petroleum based fluids will result in O-ring seal failure. A high temp race grade DOT4 fluid is recommended to reduce heat absorption. We recommend EBC, Wilwood, or Pentosin brands of high temp fluid for their high boiling point and excellent stability.

Q: How do I dial indicate my Bellhousing?

The Driven Man/American Powertrain Bellhousing Alignment Measurement and Correction

Background: Modern transmissions use tightly tolerated taper roller bearings to support the input shaft. These bearings are far superior to the ball bearing assemblies of older transmissions; however their exacting specifications require that the input shaft has almost perfect linear engagement to the pilot bearing in the crank shaft. Improper centering of the transmission to the crank can cause premature wear on the input shaft bearings, creating noise, vibration and the eventual failure of internal parts of the transmission.

Due to manufacturing abnormalities in traditional and modern bell housings and scatter-shields it is necessary to measure the accuracy of your bell housing as it relates to the crank shaft. This will insure that the input shaft, located by the bore hole in the back of the bell, lines up directly with the crank.

NOTE: IT IS IMPERITIVE THAT YOU MAKE THIS MEASUREMENT. FAILURE TO CORRECT A MISALIGNED BELL HOUSING WILL VOID YOUR TRANSMISSION WARRANTY.

A video of this procedure can be viewed here:

You will need:
  • A magnetic base dial indicator with a .001” resolution (.0005” preferred)
  • Large ratchet handle, breaker bar or flywheel tool to turn crank
  • Appropriate tools for tightening bell housing bolts
  • Permanent black marker (Sharpie)
You may need:
  • Appropriate tools for removing dowel pins
  • Offset dowel pins to correct out of spec condition
Proceedure:
  1. With the flywheel installed if possible, place the bell housing on the back of the engine and fasten with at least four bolts, insuring that the bell is seated against the block.
  2. Place magnetic indicator on the flywheel (or crank hub if flywheel is not installed). IT DOES NOT NEED TO BE CENTERED IN THE CRANK. Set the measuring finger on the inside of the bore of the bell housing (see photo) at the 12-o’clock position.
  3. Zero the indicator dial at 12 o’clock. With a permanent black marker, mark a zero on the back of the bell at 12 o’clock.
  4. Turn the crank until the measuring finger is at the 3 o’clock position. Record the measurement with the marker. Make sure you record if the result is positive (to the right of zero) or negative (to the left of zero).
  5. Repeat step four at the 6 o’clock and 9 o’clock positions, recording your results. Then return the indicator to 12 o’clock and make sure it measure zero. If the indicator does not measure zero at 12 o’clock then the base has moved during the procedure and you will have to repeat steps 3 through 5.
How to interpret the numbers:

The acceptable tolerances for Tremec transmissions is .005” of total runout. The following formula will tell you how much runout you have.

Reading at 12 o’clock – Reading at 6 o’clock = Vertical Axis Run Out

Reading at 3 o’clock – Reading at 9 o’clock = Horizontal Axis Run Out

Examples:
  1. 12 o’clock = 0
    And
    6 o’clock = -.004
    Then your Vertical Runout is 0 - -.004 = .004” (within tolerance)
  2. 3 o’clock = .009”
    And
    9 o’clock = .006”
    Then your Horizontal Runout is .009 - .006 = .003” (within tolerance)
  3. 3 o’clock = -.008
    And
    9 o’clock = .013
    Then your Horizontal Runout is -.008 - .013 = .021” (.016” out of tolerance)
Interpreting The Numbers:
  • If you are out of tolerance (> .005” +/-) on only one axis, then you will correct directly along that axis. The vertical axis will be corrected by a direct north or south movement of the bell housing, the horizontal by a direct east or west movement.
  • If you are out of tolerance on both axes, then you will be correcting along a diagonal. For example, if you’re bell housing is sitting .008” to the south (down) and .009” to the east (right) of center then you will correct toward the northwest to move the bellhousing up and to the left.

If your two axis measurements are less than .005”, as shown in example one and two, then your bell housing is within tolerance and you can proceed to install your transmission.

If the number is greater than .005” (+/-) then you must use the following procedure to correct the runout.

  1. Remove indicator and bell housing and set aside for later use.
  2. Remove dowel pins using one of the following methods:
    • Some engines have punch holes behind the pins. If you have this style of engine you can simply use a pin punch and a hammer to remove the old pins.
    • Grasp with vise style pliers and slowly turn pin while pulling away from the block.
    • Weld a steel nut to the end of the pin and twist assembly out with a wrench or vise style pliers.
    • Our favorite method for removing ornery pins involves the use of an aerosol spray freezing agent available at most parts stores. Simply place vice style pliers on the pin, heat the block around the pin area, spray the pin with the freezing agent and pull. The pin will shrink away from the heated block and usually come away very easily.
  3. Once the dowel pins are removed you will need to install “offset” dowel pins in the block. Offset dowel pins come in .007”, .014” and .021” sizes and correct for twice their value. Therefore, a .007” dowel pin will correct for as much as .014” of total runout. These pins are available from us, or from your local speed shop or racing supply retailer.
  4. Remove the dowel pins from their package and using the permanent marker or bright nail polish, mark the high side of each pin. This will help you align the pins when you press them into the block.
    NOTE: THE MOST ACCURATE WAY TO FIND THE CORRECT POSITION FOR THE DOWEL PINS IS TO DETERMINE THE POSITION WHERE THE BELL HOUSING BORE IS CLOSEST TO THE CENTER OF THE CRANK AND POINT THE HIGH SIDE OF THE OFFSET PINS AT THAT POSITION. YOU CAN FIND THIS POSITION WITH THE DIAL INDICATOR. SEE ILLUSTRATION:
    !!ALWAYS POINT HIGHPOINT ON PINS IN THE SAME DIRECTION!!
    DIAL INDICATOR ILLUSTRATION
  5. Once you have marked the high side, tap the pins into the block using a brass hammer, dredge or hardwood block to avoid mushrooming the pin. A light petroleum based lubricant should be used. Approximate the direction of correction as described above. In the example above we would put a .007” dowel pin in, with the high side pointing northwest.
  6. Once installed, place the bell housing back on the block and repeat the runout procedure. If you are still out of tolerance you can turn the new pins to fine tune their position. Most dowel pins have a slot or Allen head hole to make it easy to make fine adjustments after installation.
  7. Once you have reached a runout condition of less than .005” total runout, record your four measurements on this document and keep for warranty purposes.
Final Measurements:
12 o’clock ______________
3 o’clock_______________
6 o’clock_______________
9 o’clock_______________
Vertical Runout __________
Horizontal Runout ___________
Thank you for taking this important step in the installation process. If you have any questions or need help interpreting your results you can call us anytime at 931.646.4836.