REM polishing is a big help. Lowers friction which lowers temps and better lubrication as well. All the go fast car and motorcycle racers do it to almost every rotating part, from NASCAR, Indy to F1. First pic is before and after.
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wish I had known about this before I rebuilt my drives.

pstorti, This polishing does not affect the gear lash. It is not too hard to remove the gear sets. Just need to protect the captive bearing on the gear when polishing. Then just put them back together.