American Powertrain Expands Distribution Adds Original Parts Group, Inc. (OPGI) to Dealer Network

Now offers American Powertrain 5 and 6 speed transmission conversion kits for Chevrolet A Body Vehicles

American Powertrain, the world’s largest TREMEC dealer and manufacturer of muscle car transmission systems and related components, is pleased to announce that the company’s products are now available at Original Parts Group Inc. (OPGI).  OPGI is the industry’s leading supplier and manufacturer of restoration and high performance parts for classic GM vehicles offering over 75,000 classic GM restoration and performance parts and accessories including transmission replacement parts.

Tony Giroux, OPGI New Products/High Performance Product Manager, says, “We are widely known for our comprehensive selection of GM restoration parts. In actuality, OPGI now offers many high-performance replacement products; though until now, never a transmission conversion kit. We have long noticed that 5-speed and 6-speed swaps are growing in popularity, especially for Chevelle, so the timing was right to investigate a conversion kit supplier that had the quality and depth of product we are looking for all our A and G Body vehicles. I’ve long been familiar with American Powertrain and this company fits our standards in product quality, ease of instruction and customer service.”

OPGI is now offering both 5 and 6-speed conversion kits for popular classics including the GTO, LeMans, Chevelle, El Camino, Cutlass, 4-4-2, Skylark, Monte Carlo, Regal and GS.

Currently, the 5 speed ProFit TKO transmission conversion kits for the GTO are featured in the company’s GTO free print catalog as well as being available online. Additional American Powertrain product offerings include the Hydramax T56 and Muncie/TKO hydraulic clutch kits and GM Bellhousing spacer.

Matt Graves, American Powertrain’s Marketing Manager, says, “OPGI is highly respected as the authority for restoration GM parts and is swiftly gearing up their high-performance product line. We are very excited to add OPGI to our growing dealer network and look forward to growing our sales with them.”

Giroux adds, “American Powertrain is now in the GTO catalog because our largest catalog, the Chevrolet Chevelle, was already out to the public. This has been an excellent decision based on the feedback we have received to date from our customers.”

All OPGI catalogs are completely free and available by mail, phone (1-800-243-8355) or through the OPGI website at

For more information visit To speak with one of American Powertrain’s highly qualified technicians, call 931-646-4836. For weekend and holiday calls, a call back service is available at 423-773-9789.

4 thoughts on “American Powertrain Expands Distribution Adds Original Parts Group, Inc. (OPGI) to Dealer Network

  1. I have a 1972 Buick with a 455 and would like to convert to a 6 speed. Do you have a complete kit including pedals and bell housing?

    1. Hey Donald. We sure do. We like do a customized quote for this application. Give us a call at 931-646-4836 or shoot us an email at [email protected] We will build you a customized quote and email it to you.

  2. Hi I contacted your company some time ago and never got any response from you. I live in Alberta Canada. I am currently working on a 67 camaro convertible with a moser 9 inch rear end. I plan on running a 327 engine. I was looking for a complete kit from the bellhousing to the driveshaft and a 6 speed magnum tremec transmission. my car was originally a 3 speed on the floor saginaw. I want to use the stock hole in the floor so would most likely need an offset shifter on the transmission. I dont have a bellhousing or clutch yet and dont know what will be compatible. I would appreciate any info you can supply and a price quote including shipping to canada.

    1. Hey sorry about that. We looked in our system for your email and didn’t find anything. It may have got caught up in the spam filter. I will have one of our sales guys reach out to you today via email. Or you can call us at 931-646-4836

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