You should do it yourself, the mouldings will never be exactly the same from car to car.
A couple of things to bear in mind...
- The top and bottom gearcases are not necessarily identical so double check the shimming in both and again once assembled.
- Use shims on both the input shaft and the diff outdrives to get rid of any unwanted movement. Align the input gear so it is meshing fully with the diff gear and not rubbing on the edges.
- Shim the gears to have the BARE MINIMUM freedom in the mesh. Not fully tight, and certainly not loose. Get the finest shims you can find, 0.1mm or less. The kit ones are 0.2mm and too crude for the job.
I had loads of hassle getting my BMAX shimming right, but after a few stripped gears and one cooked motor I got it sorted by using the strategy above.
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