1978-88 GM G-body (Malibu, Monte Carlo, El Camino, Regal, Cutlass)


Halfway Through 2020 Sale! Shift into Overdrive to out run the apocalypse! We are offering $250 off all Pro-Fit kits with transmission. Plus get a free SaveTheStick shop banner! Now till the end of August. Phone in orders only. Plus we have financing and layaway available. Call us at 931-646-4836 for more info.

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If you don't know what you need, call our technical sales staff at 931-646-4836


American Powertrain Pro-Fit kits for 1978-88 GM G-body

Choose either 5 or 6-speed. 

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

TKO Gear Ratios
TKO 500 – 3.27, 1.98, 1.34, 1.00, 0.68
TKO 600 – 2.87, 1.89, 1.28, 1.00, 0.64 OR 0.82

T56 Magnum Gear Ratios
Close Ratio 2.66, 1.78, 1.30, 1.00, 0.80, 0.63
Wide Ratio 2.97, 2.10, 1.46, 1.00, 0.74, 0.50

Kit includes:

AP Revolution Shifter Mechanism locates shifter – will fit bench or bucket seats
Seamless DOM Driveshaft Assembly – Race Balanced, Solid U-Joints
Driveshaft Slip Yoke – Cryogenically hardened steel

Adjustable crossmember
Transmission Mount – Polyurethane

Pilot Bearing – Stainless rollers, grease pre-pak
Reverse Light Harness – Weatherseal
Speedometer Conversion Electronic
Shifter Knob
Hardware, Instructions, Warranty

Tunnel modifications required


Hydraulic clutch recommended. G-body bolt in kit available here

Weight: lbs

Dimensions: W" x H" x L"

If you don't know what you need, call our technical sales staff at 931-646-4836