1979-93 Mustang Fox Body TKX 5-Speed Kit


Pro-Fit TREMEC TKX 5-speed Installation Kit for 1979-93 Mustang

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If you don't know what you need, call our technical sales staff at 931-646-4836


Featuring the new Tremec TKX 5-speed manual transmission!

TKX Gear Ratios

Wide Ratio – 3.27, 1.98, 1.34, 1.00, 0.72
Close Ratio – 2.87, 1.89, 1.28, 1.00, 0.68 OR 0.81 5th

  • Rated for up to 600 ft-lb of torque
  • up to 8000 rpm shifting capacity 
  • Just 99lbs (dry)
  • Input Shaft: 26 Spline. Output 31 spline yoke required.
  • Multiple shifter locations & dual speedo pick-ups for extreme versatility
  • Robust 3-rail internal shift mechanism offers firm, positive shifts
  • Recommended for street use and low rpm highway cruising
  • Comes with American Powertrain’s industry leading 2 year warranty
  • Fox Body Mustang requires a TKX/TKO/Toploader bolt pattern bell housing (sold separately) 

The Tremec TKX series of 5-speed transmissions are a great way to add an overdrive transmission to your project.  Designed and built as a direct replace for factory 4 and 5 speeds in some applications, this line of 5-speeds will likely fit your original bell housing, and in most cases utilize the factory flywheel, pressure plate, and mechanical clutch linkage if they are all in good condition.  Some conversions will only require a new 26 spline clutch disc, slip yoke/shortened driveshaft, and cross member relocation. American Powertrain has a variety of shifter stub relocation kits available to allow you to retain your factory 4-speed console or shift lever location. The TKX series has 3 different shift locations available and is also equipped with the ability to give you a mechanical or electronic speedometer output, built-in neutral safety and reverse light switches. There are multiple gear set options to accommodate a wide range of rear gear ratios and tire sizes. Its compact size also allows it to fit most cars without transmission tunnel modifications.  Transmission strength upgrades are also available with our Extreme upgrade.  If you have any questions please give us a call before you buy. 931-646-4836.  

Kit includes:

  • Tubular Crossmember Available* *kit comes without a crossmember. You can upgrade to one or you can modify the factory T-5 crossmember
  • Reuse your stock driveshaft by swapping out our yoke provided in the kit. 
  • Polyurethane transmission mount
  • Pilot bearing
  • speedometer conversion
  • shifter knob
  • hardware instructions and Warranty

Weight: 38 lbs

Dimensions: W36" x H24" x L36"

If you don't know what you need, call our technical sales staff at 931-646-4836