1. Different Transmission Mount Points: The transmission mount points on the 1986 Ford may not match the mount points on the 1974 F350 transmission, requiring extensive modifications to the vehicle's frame and drivetrain components.
2. Clutch and Flywheel Compatibility: The clutch and flywheel used in the 1986 Ford vehicle may not be compatible with the transmission from the 1974 F350. The clutch splines and flywheel bolt patterns may differ, necessitating further modifications or sourcing of compatible components.
3. Transmission Gear Ratios: The gear ratios of the 1974 F350 4-speed transmission might not be suitable for the 1986 Ford vehicle. This could impact the vehicle's overall performance, acceleration, and fuel efficiency, potentially causing drivability issues.
4. Driveshaft Length: The transmission from the 1974 F350 may have a different output shaft length than the original transmission in the 1986 Ford. This could require modification or replacement of the driveshaft to accommodate the new transmission's length.
5. Electrical and Control Compatibility: The 1974 F350 4-speed transmission may not have the same electrical connections and control systems as the 1986 Ford transmission. This could result in issues with gear selection, shifting, and synchronizing with the vehicle's engine and drivetrain components.
6. Safety Considerations: Installing a transmission from a different vehicle raises concerns about safety and reliability. The 4-speed transmission from the 1974 F350 may not meet the safety standards or regulations applicable to the 1986 Ford, potentially compromising the vehicle's overall safety.
Given these challenges and potential compatibility issues, it would not be advisable to install a 4-speed transmission from a 1974 F350 Ford into a 1986 Ford. It would be better to source and install a compatible 4-speed transmission designed specifically for the 1986 Ford vehicle to maintain optimal performance and safety.
