OPGI.com works best with JavaScript enabled.
Holiday Bonus Free shipping over $199 + up to 20% off Restoration - use code: WINTERSALE
  • As seen on
  • Rust Valley Restorers
  • Barret Jackson

American Powertrain

ProFit Transmission Set, T-56 Wide Ratio, American Powertrain, 1964-67 A-Body

Vehicle Specific View fitment for 7 models
Part# CH31429
Mfg# COGM-A1J
Sold As Set
$4,895.99
List Price: $5,386.95
You Save $490.96

Ships direct from manufacturer
Allow 2-6 weeks for item to arrive.
Add To Wishlist 

Modern 6-speed manual transmission

Available in two different gear ratios

Do you want to have the convenience of a modern 6-speed transmission in your classic GM A-Body, but do not know what to purchase? OPGI now offers these T-56 6-speed ProFit Conversion Kits from American Powertrain. Regardless of having a stump-pulling 600 horsepower big block or a modest 350 horsepower small block under the hood, these 6-speed Magnum transmissions are built to withstand up to 700 lb.-ft. of torque. Available in either a close ratio or wide ratio configuration, we have exactly what you are looking for your application. American Powertrain has designed these kits to be as comprehensive as possible, yet allowing for some customization to what you as the customer is looking for in the perfect transmission for your application.

Each kit includes: AP Revolution shifter mechanism for OE 4-speed position, seamless DOM driveshaft assembly, cryo hardened steel driveshaft slip yoke, transmission mount, stainless roller pilot bearing, modular reverse light harness, modular reverse lock-out harness, mechanical or electronic speedometer conversion, transmission tunnel patch, shifter knob, hardware, detailed instructions and warranty information. Close ratio T-56 Gear Ratio: 1st: 2.66, 2nd: 1.78, 3rd: 1.30, 4th: 1.00, 5th: 0.80, 6th: 0.63 Wide ratio T-56 Gear Ratio: 1st: 2.97, 2nd: 2.10, 3rd: 1.46, 4th: 1.00, 5th: 0.74, 6th: 0.50

Notes

  • Requires bellhousing adapter or engine specific bellhousing.
  • Requires 26-spline clutch disc.
  • Modifications are necessary.
  • 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 cannot be shipped FedEx Ground and requires Truck Freight Delivery which must be prepaid by credit or check (no C.O.D). Please call or email us for an exact quote.
  • 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 These Catalogs

  • 2024 Chevelle, El Camino 64-77 286
  • 2024 Cutlass, F-85 & 442 61-77 190
  • 2024 GTO, LeMans & Tempest 210
  • 2024 Skylark, GS & GSX 61-72 165
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
1964–1972 Buick Skylark wide ratio
1964–1967 Chevrolet Chevelle wide ratio
1964–1967 Chevrolet El Camino wide ratio
1964–1972 Oldsmobile Cutlass wide ratio
1964–1972 Pontiac GTO wide ratio
1964–1972 Pontiac LeMans wide ratio
1964–1970 Pontiac Tempest wide ratio
  • Headshot of OPGI Employee
    Have a Question? Chat with an Expert or Call 1‑800‑243‑8355
    Mon‑Fri 8:00‑4:30 PT Experts are currently offline
  • Low Prices. Price Match Guarantee
  • GM Automotive Experts. We know car parts
  • Guaranteed Fitment. 100% factory accurate
  • Superior Selection. Largest selection of in-stock parts

Customers Who Viewed This Item Also Viewed

Reviews (0)

UH OH! Product reviews didn't load.
Please reload the page, or unblock our review partner Yotpo.com.
ProFit Transmission Set, T-56 Wide Ratio, American Powertrain, 1964-67 A-Body
American Powertrain ProFit Transmission Set, T-56 Wide Ratio, American Powertrain, 1964-67 A-Body