Basic task in theory, yet tough labor in practice, to re-shim the pinion. So INSPECT backlash for loose vs tight. And try to get a tooth mesh pattern while in there.
Tooth pattern: look for "hi-lo" contact for Forward and Reverse. Also depth of engagement.
If engagement depth is too shallow then pinion need shimmed out. Too deep (rare), then remove some shim.
Goal is tooth contact in tooth mesh middle zone (as equal as practical) for forward and reverse. I think
When all quiet, use Redline AntiShock gear "oil". For zero wear. Posi additive is a must with that stuff.
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