Made in USA
COGM-T3J Tremec Magnum 6-Speed Transmission ProFit Kit for 1988-1998 Chevy OBS/GMT400 Trucks [Wide Ratio]
InfoVehicle Info Needed
AMERICAN POWERTRAINPART NUMBER: 632-COGM-T3J

COGM-T3J Tremec Magnum 6-Speed Transmission ProFit Kit for 1988-1998 Chevy OBS/GMT400 Trucks [Wide Ratio]

$4,46115$4695.95You Save$234.80
Truck Freight
ShippingShips on 09/21/2026
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Tremec Magnum 6-Speed Transmission ProFit Kit
  • 1988-1998 Chevy OBS/GMT400 Trucks
  • Wide Ratio: 2.97, 2.10, 1.46, 1.00, 0.74, 0.50

    American Powertrain COGM-T3J Features:

    • 30-50% Increase in fuel economy
    • Low RPM cruising for greatly reduced driver fatigue and an improved highway driving experience
    • Reduced engine wear leading to longer engine life
    • Cooler engine operating temperatures
    • Reduced NVH (noise – vibration – harshness)
    • Requires 6-speed bell housing and 26-spline clutch disk

    Includes:

    • White Lightning Mid-Shift Mechanism – Original shift position
    • Driveshaft slip yoke – Cryogenically hardened steel
    • Uses the factory crossmember
    • Transmission mount – Polyurethane
    • Pilot bearing – Stainless rollers, grease pre-pak
    • Reverse light harness – Weatherseal
    • Speedometer conversion – Mechanical or electronic
    • Shifter knob
    • Modular reverse lock-out harness
    • Modular reverse light harness
    • Hardware, instructions, warranty
  • Part TypeManual Transmission
    BrandAMERICAN POWERTRAIN
    Package Height16.0
    Package Width18.0
    Package Length36.0
    Weight175.0 PG
    Part CategoryPerformance Parts
    Part FitmentDirect Fit
    Vendor Part NumberCOGM-T3J
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews
    Some parts are not legal for use in California or other states with similar laws / regulations
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