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HomeGarageNew 6-speed gearbox designed for vintage Mopar muscle

New 6-speed gearbox designed for vintage Mopar muscle

Gen III Hemi transmission can handle 1,100 pound-feet of torque, says American Powertrain

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Those restoring and resto-modding a vehicle with a high-horsepower Hemi engine such as the Hallcat, Hellcrate or Hellephant engines, have a new option for a 6-speed transmission designed to deal with output: American Powertrain has introduced a high-horsepower Gen III Hemi transmission package.

The Cookeville, Tennessee-based company says the new gearbox is designed for engines up to 1,100 pound-feet of torque.

“The Stage 2 upgrade takes high horsepower Tremec Magnum 6-speeds to a new level with increased torque capacity,” the company notes.

“The package includes transmission backed up with a proven DYAD dual disc clutch by Centerforce Clutches, rated for a holding capacity of 1100 lbs-ft of torque at the crank. The kit also includes a QuickTime steel scattershield bellhousing, Hydramax hydraulic conversion bearing, four quarts of transmission fluid and all the hardware needed for installation.”

The Magnum 6-speed is designed for those planning to do a Gen III engine swap into a classic Mopar muscle car, the company adds.

Larry Edsall
A former daily newspaper sports editor, Larry Edsall spent a dozen years as an editor at AutoWeek magazine before making the transition to writing for the web and becoming the author of more than 15 automotive books. In addition to being founding editor at ClassicCars.com, Larry has written for The New York Times and The Detroit News and was an adjunct honors professor at the Walter Cronkite School of Journalism and Mass Communication at Arizona State University.

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