American Powertrain TKX Pro-Fit 5-Speed 26-Spline .68OD Kit W/Offset F-100 61-79

Transform the driving experience of your 1961–1979 F-100 with this 5-speed combo kit (COFO-T1EX). It features a 26-spline input and wide-ratio gearing. This system includes a 0.68 overdrive for low-RPM cruising, 30–50% better fuel economy, and improved engine longevity. The 2.25” shifter offset places the handle exactly where you need it for confident shifts every time. Whether you’re commuting or cruising, this modern upgrade delivers refined drivability and quieter operation.

Features and Benefits:
- Ratio: 1st 2.87 and 0.68 5th overdrive
- Low RPM cruising for greatly reduced driver fatigue
- Improved highway driving experience
- 30–50% better fuel economy
- 0.72 overdrive for reduced RPMs
- 2.25” AP Revolution shifter offset
- Reduces noise, vibration, and harshness
- Extends engine life with lower wear
- Cooler engine operating temperatures
- Bolt-in crossmember uses factory holes
- Includes driveshaft slip yoke and hardware
- Durable polyurethane isolator mount
- Mechanical or electronic speedometer options

Kit Includes:
- TREMEC TKX 5-speed transmission
- Driveshaft slip yoke (shorter driveshaft required)
- Adjustable bolt-in cross member (black powder coat, uses original bolt holes)
- Isolator mount (polyurethane)
- Speedometer solution (mechanical or electronic)
- Conversion pilot bearing
- Weather seal reverse light harness
- Hardware and complete instructions

Vehicle Fitment:
- 1961-1979 F-100s

Please Note: A 26-spline clutch disc is required.