Zach you can use the transmission input shaft with bearing cage put in the front transmission housing opening to hold the main shaft at the front. Put the piliot bearing on the main shaft first. When checking a pattern, turn the pinion shaft and put some drag on the ring gear. That way the pinion shaft will try to shift forward as much as the ball bearing lets it. If turning the ring gear with drag on the pinion shaft, shaft will shift rearward a few thousands. Check pattern with pinion shaft trying to move forward. Differential bearing support housings have the oring thats kind of costly. may want to leave the orings off until the final assembly. If the differential bearings don't get to tight use the right support housing in or out to get the pattern you want (may also have to adjust pinion shaft if off) and that should be near the backlash gears had when removed. Put that on a paper if you found it. If the differential bearings are getting squeesed when adjusting the left support will need a shim or shims added. After you have the gear pattern or adjustment wanted, shim the left differential bearing support so you have a .010 to .020 shift or play on the differential from side to side.
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