American Powertrain’s New Pro-Fit TKX 5-Speed Kits for ’66-’70 B-Bodies

The all-new Tremec TKX is starting to slide under muscle cars across the world and turn-key kits are piling up. American Powertrain, a Tremec Elite Distributor, is already stocking shelves with Mopar systems, beginning with a TKX Pro-Fit 5-speed setup for 1966-1970 B-bodies. With a more streamlined and svelte case than its predecessor, the TKO, tunnel modifications are about to be thing of the past.

“The TKX Pro-Fit fits vintage Charger, Coronet, GTX, Road Runner, Satellite, Belvedere, Super Bird and Super Bees like an original A833 manual transmission with the correct shift position and tunnel fit,” says their press release. This is accomplished via American Powertrain’s mid-shift modification that closely resembles the factory 4-speed stick location. They even offer replica pistol grip shifter handles and updated shift pattern plates for a stealthy appearance.

Just like any other TKX, the one in their Mopar B-body kit features a 600 lb-ft torque rating and can handle shifts up to 8,000 RPM. Included are a White Lightning shifter mechanism, balanced 3.5” seamless DOM driveshaft, slip yoke, bolt-in cross member, isolator mount, speedometer connection (mechanical or electronic), pilot bearing, release bearing, reverse light harness, hardware, and instructions. Application-specific bellhousings and clutches are available to complete the installation as required.

Also worth noting are American Powertrain’s two-year warranty and all-inclusive technical support by phone or email. Kits will start shipping in spring of 2021, so request a quote now to save your spot in line.

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Kent Will

Kent grew up in the shop with his old man and his '70 Charger R/T. His first car was a 1969 Super Bee project when Kent was fourteen. That restoration experience lead to pursuing a degree in Mechanical Engineering and a career in manufacturing. Since then, the garage has expanded to include a '67 Satellite, a '72 Scamp, and a 2010 Mopar '10 Challenger.

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