[Metallover]

You don't need to open the diffs - just take off the bearing. On the gear diff you just slide off a shaft and the bearing will come off from there. With the ball diff you just need to slide off the bearing to put in the shim.

Unless you are shimming the inside of the gear diff.. yeah that is what you meant. Whoops. I put a piece of thin plastic cut to a shim shape in there. It is holding up pretty darn good (in the front).

It really depends if you are stripping the outside ring and pinion gears or the internal... Planetary? gears.

Just a note about McMaster-Carr - They have absolutely everything you would ever need to build anything you would ever need. They even have 2.5" pvc pipe so you can shoot tennis balls....