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ProFit Transmission Kit, TKO600RR, American Powertrain, 1968-72 A-Body, Swap

Vehicle Specific fits 4 models
0 Reviews
Part# CH31386
You Save $359.96
Ships direct from manufacturer

Best engineered A-body kit

Available in several configurations

OPGI is proud to offer these TKO 5-speed conversion kits from American Powertrain. Whether you currently have a 4-speed and are looking to drive your classic A-Body more and maximize fuel economy on the highway, or are looking to do an automatic transmission to manual transmission swap, we have the kit for you. With 3 different transmission kits to offer, we have something that will guarantee to meet your exact needs. American Powertrain has developed these transmissions with maincase streamlining. What this means is that you are minimizing or completely eliminating transmission tunnel modifications but will also allow the use of the original transmission crossmember. This ensures that your vehicle will still retain the original look and feel of your chassis and interior but giving you the convenience of having a modern overdrive transmission. Add your bellhousing, clutch and linkage and your driveshaft and you are ready to slam gears in your brand new 5-speed transmission. Not only do these transmissions give you tire shredding light to light performance, but you can also slide into 5th and cruise down the highway getting noticeably better fuel economy. These modern overdrive transmissions are essentially the best of both worlds! Each TKO transmission is rated up to 600 ft.-lbs. of torque and will handle anything you can through at it. The TKO500 features a 3.27 1st gear with a .68 OD ratio, the TKO600RR is perfect for those vehicles looking to do some road race events with a 2.87 1st gear and .82 OD ratio, and last but not least the TKO600SS features a 2.87 1st gear with a .64 OD ratio.


  • Each kit includes: AP Revolution offset shifter mechanism for OE 4-speed shifter position, cryo hardened steel driveshaft slip yoke with 1330 style u-joint, mechanical speedometer conversion, VSS wiring harness for electronic speedometer or fuel injection, reverse light wiring, transmission mount, steel roller pilot bearing, shift knob, hardware, detailed instructions and warranty information.
  • 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 be drop-shipped from the manufacturer.
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

Vehicle Fitment

Make & Model Year Range Application Details
Chevrolet Chevelle 68-72 TKO600RR, 2.87 1st, .82 OD
Chevrolet El Camino 68-72 TKO600RR, 2.87 1st, .82 OD
Chevrolet Monte Carlo 70-72 TKO600RR, 2.87 1st, .82 OD
Pontiac Grand Prix 69-72 TKO600RR, 2.87 1st, .82 OD
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ProFit Transmission Kit, TKO600RR, American Powertrain, 1968-72 A-Body, Swap
ProFit Transmission Kit, TKO600RR, American Powertrain, 1968-72 A-Body, Swap