Best way to get a free gearbox is to:
1. Put your diff in the gear casing without the pinion gear in.
2. Shim the diff (doesn't matter which side with the thinnest shims until there is no side to side play between the diff and casing. (You now know how many shims you can 'play' about with.
3. Put the pinion gear assembly in.
4. Move the shims around until you just get a little bit of back-lash between the crown gear and pinion.
5. Rotate the crown gear checking the mesh all around.
Each diff can be different as there are slight tolerances between each part.
All of my diffs have no shims on the metal crown gear and either 0.1 or 0.2mm on the case side.
Basically I'm running the mesh as loose as I can..
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