The shimming procedure used to be well documented on One18th.com before they got shut down by Megatech.
But I just found this post from a quick Google search:
This explains the spider gear shimming.
The bevel gear shimming is a little more straight forward. I haven't done this for a while though so this is from memory:
-Open the diff case up.
-Unscrew the bevel gear from the input shaft.
-Place a shim behind the bevel gear, or the bearing. I think there's a bearing in there.
-Put it back together and test the mesh between the bevel gear and the ring gear.
I'm thinking about bringing my mLST2 back to life soon. I'll try to take the diff apart and make a detailed explanation with pictures because it helps a lot.
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