shimming 101
thought i might share what i found out about this to help the others following. firstly this is a diff shim. when mine was pulled apart it had multiple shims in it, after the new diff went in, it was measured and found that one had to come out.
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i dont know what the availability on all the different shims (thickness wise) is like in the usa, but in australia there is none genuine. amayama has some, if you want to wait, or you could get something like these, and make your own, or get a local engineering place to make them.
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now these shims help the diff sit snug in the transmission case. getting the right clearance is important to preserve the bearings. to tight and it wont spin, too loose and the bearings will wear. it will take time, and maybe a few fitments, to get it right. here's a picture of mine (32v case,big bearing and shim), you can see the shim in there, tucked underneath the outer bearing shell.
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my guys reckon most factory shim specs are too tight. they suggest the widest clearance within spec. shim spec list.