Looks like AE have admited the problem so I guess if you contact either the shop you bought it from, or, CML they may be able to suply the shims.
I copied and pasted this from the USA AE site:
OK GUYS AND GALS, here is what was found out from our R&D department.
The material that the diff gears was to be made up off was changed to beige type material we have in the kits and the material cools differently, and sometimes when the part (ie:gear) cools after being molded it could have an extra hundred thousand of more space inside where the large spider gear are placed.
So in some of the gears when you take off you hear a clicking sound or when you turn.
Not all of them will have this, but some do and the ones that do should get me your info.
We have the shims that it takes to correct this and just need you to fax or mail me your address with the notation of SC10 Shims on it and I will send you out the shims to correct the spacing problem.
The RTR's will have the shims included in the box and if needed they can be installed.
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