Home - American Powertrain - TREMEC Conversion Specialists

Videos

Jeff Schwartz' 1950 Studebaker With Six Speed Magnum

Jeff Schwartz of ‪Schwartz Performance‬ had his 76 year old family heirloom 1950 Studebaker 'Bullet Nose' Champion in our booth at ‪Triple Crown Of Rodding. Watch as he and Matt Graves go over this unique and well executed build. The Studebaker features a custom Schwartz G-Machine Chassis, a LS3 disguised as a Studebaker V8, and of course a 6 speed ‪TREMEC‬ Magnum from ‪ American Powertrain‬

American Powertrain 1977-1990 GM B-Body Kit Featuring Matt's 6 Speed Cadillac Test Car

American Powertrain is excited to announce our 1977-90 GM B-Body TREMEC TKX 5 Speed & Magnum 6 Speed and the car we used to engineer this kit, our very own Matt Graves' Chicken Coupe 427 LS powered, TREMEC Magnum 6 Speed Equipped Pro Luxury 1983 Cadillac Coupe DeVille known as the Chicken Coupe. Now a 3X Hot Rod Power Tour long hauler and road tested at the infamous Tail of the Dragon.

AmericanPowertrain NBS Chevy GMT800 5 & 6 Speed Kits

American Powertrain GMT800 5&6 Speed Kits for 1999-2006 Chevy & GMC 2WD trucks. Last summer we got a 2000 Chevy shop truck with 5.3 LS engine that we could also use as a test bed for TREMEC TKX 5 Speed and Magnum 6 Speed Kits. Watch as Matt goes over the details on the 6 Speed kit, including the bolt in Malwood hydraulic clutch pedal, shifter setup and new adjustable crossmember.

News & Tech

American Powertrain Now Offers Turnkey ProFit™ 5- and 6-Speed Transmission Conversion Kits for GM 1977 – ’90 B-Bodies

Perfect Fit, Optimal Driving Performance, Improved Fuel Economy Cookeville, TN (August 11, 2026) – American Powertrain, a leading source for modern overdrive systems, now offers its...

Brand New TREMEC TKX Stuck In Gear? Let's Fix It. How To Align Shift Rail Lugs.

Got a new TREMEC TKX 5-Speed and it seems like it is stuck in gear? It’s an easy fix! What is happening and why is...

American Powertrain™ Introduces Pro Fit TKX 5-Speed and Magnum 6-Speed 2WD Conversion Kits for 1999-06 Chevy/GMC NBS GMT800 Trucks

Now in stock. Designed to keep the stock appearance with precision fit. COOKEVILLE, TN (March 25, 2026) – American Powertrain™, a leading source for modern overdrive systems,...

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