There are 4 mini bevel gears that sit inside the diff housing.
There are also two bevel gears that sit behind the diff outdrives (the other side of where the driveshaft enters the diff).
The shims that were mentioned are to go behind the diff output gears, and effectively tighten up the mesh between the mini bevel gears, and the diff output gears.
Sorry i cannot make this any clearer!!
Take it back to the shop, or get a racer at a local club to have a look for you.
Cheers
Mark
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