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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 73-87 Chevy/GMC C1500

Choose either TREMEC TKX 5 or Magnum 6-speed. Some floor trimming for 6-speed maybe required. 

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

TKX Gear Ratios
Wide Ratio – 3.27, 1.98, 1.34, 1.00, 0.68
Close Ratio – 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
X-Factor Aluminum Adjustable Squarebody Crossmember

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

Bell housings, clutches and shifter available as well. Got an LS swap? We can make it easy. 

Hydraulic clutch recommended. Can use a stock pedal and factory hydraulic master cylinder for some model years. Hydramax bearing adapter line required. Complete Hydramax System available for Squarebody. 

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