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American Powertrain

ProFit Transmission Set, Tremec Magnum 6-speed, 1978-88 G-Body, Swap

Vehicle Specific View fitment for 9 models
Part# L241540
Mfg# COGM-G6
Sold As Set
$4,496.99
List Price: $4,947.95
You Save $450.96

Ships direct from manufacturer
Allow 2-6 weeks for item to arrive.
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Strength where it Counts 700 lb/ft of torque capacity

American Powertrain ProFit Magnum 6-Speed Kit for 1978-88 GM G-body. The centerpiece of TREMEC's high performance line-up, the Magnum 6-speed takes our state-of-the-art OEM technology and pairs it with the most popular flexibility features of the all-business TKO. The result is a double-overdrive transmission that easily tolerates up to 7800 rpm and 700 lb-ft. of torque, delivers unbelievable sophistication, and is far more flexible than any other 6-speed in the market. Known in its OE form as the TR-6060, the Magnum is an aftermarket variant of the same transmission found in many of today's most revered factory muscle cars; meaning refinement where you want it and strength where it counts. Reasonably light at 135 lbs. dry Multiple shifter locations & dual speedo pickups for unmatched versatility Choice of two different gear ratio sets with unique double overdrive ratios Incredibly short, extremely low-effort shift throws, with crisp, precise engagement Modern OE supercar technology for the ultimate pro-tourers, road-racers, and more.

Tech Specs: Gear ratios:1st 2.66, 2nd 1.78, 3rd 1.30, 4th 1:1, 5th .80 and 6th .63 26-spline input shaft. 31 spline output. 4616 chromoly gears and shafts One-piece counter shaft Triple cone synchros 700ft-lb Constant Load Rated Kit includes: Magnum 6-speed, Tremec 11009 AP Revo shifter for correct shift position. Drive shaft slip yoke. L241507 Crossmember Poly Trans mount Reverse light harness Speedometer conversion, mechanical or electric. Pilot Bearing White shifter knob. Hardware and instructions

Notes

  • Optional hydraulic kit recommended L241508.
  • Tunnel modification required.
  • This item is not eligible for any further discounts or promotional pricing.
  • SHIP NOTE: This item exceeds standard size and is exempt from free shipping.
  • SHIP NOTE: This item is SPECIAL ORDER and will drop-ship from the manufacturer. While the majority of drop ship orders experience no delays, please be advised that OPGI does not control delivery times.

Find Item In This Catalog

  • 2024 GM G-Body 1978-1988 127
WARNING: This product can expose you to chemicals including lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride, and 4,4’-methylenebis (2-chloroaniline), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Vehicle Fitment

Year Make Model Application Details
1982 Buick Grand National  
1984–1987 Buick Grand National  
1978–1987 Buick Regal  
1983–1987 Buick T-Type  
1978–1987 Chevrolet El Camino  
1978–1983 Chevrolet Malibu  
1978–1988 Chevrolet Monte Carlo  
1978–1988 Oldsmobile Cutlass  
1978–1986 Pontiac Bonneville  
1978–1987 Pontiac Grand Prix  
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ProFit Transmission Set, Tremec Magnum 6-speed, 1978-88 G-Body, Swap
American Powertrain ProFit Transmission Set, Tremec Magnum 6-speed, 1978-88 G-Body, Swap