[pvienneau]

The U joint on TOP came out of the original truck and is a 1/2 ton set up front yoke 17 spline. The UJ on bottom seems to be 3/4 and came with new tranny, front yoke 10 spline. The BOTTOM 3/4 rear yoke fits onto the new tranny and the TOP front yoke fits onto the original drive shaft. I am looking for help/advice/answers/suggestions to next steps. My goal is to use the top 1/2 ton front yoke with the bottom 3/4 rear yoke.
Notes:
- the trunions are different sizes
- the top rear yoke from the 1/2 ton does not slide on to the new tranny main shaft
- the top front yoke fits the drive shaft of the truck
- I am not going to switch main shafts in tranny's
Questions:
- is the main shaft of the SM420 suppose to be one size fits all?
- is there a way to marry the yokes that fit main shaft and drive shaft with customer trunion and bearings
- should I wait and find a doner S10 4x4 or other rear end and then worry about the U Joint?

Thanks all.