If you change out your input shaft do you just pull the retainer and install the new shaft and bearings or do you have to redo the shims. I have done a search on this and its pros and cons. I don't know yet that I will have to but want to find out for sure.

 

If you have (or can get) a dial indicator to check shaft play then you should re-shim them. It's been a while but I think you have to pull the o/d gear housing along with 5th gear, then there are two plates that hold the bearing races and shims, one on the main shaft and counter shaft. I think the goal is .008 - .012" play. I would at least make sure you are within specs before you put it back together.