3 speed to 4 speed swap

[raycow]

Originally Posted by gregg72340

One more question can I reuse my 3 speed driveshaft or is the 4 spd a differnt length

Short answer: You will need a 4 speed driveshaft, or the front section of one if you have a 2 piece shaft now.

Long answer: The 4 speed shaft is longer than the 3 speed, but the main difference is in the way it is constructed. The 4 speed transmission has a yoke rigidly bolted to its output shaft. It looks something like the pinion yoke on the rear end. The front U-joint bolts to that yoke. To accommodate length changes, the 4 speed shaft has a slip joint behind the front U-joint. This slip joint serves the same purpose as the slip yoke on the 3 speed shaft, but is not interchangeable with it.

Ray