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# 21 is the carrier bearing shim for meshing the ring and pinion/spacing of the vlsd unit in the carrier like if you changed to a different size ring gear like I did then you would need to mess with those..did you mean #14 and #17? are the thrust shims that tighten up the vlsd unit. @ Evo808 my stock shim size out of my J30 was 1.13 and the other one around a .80. I think every J30 has its own diff sizes from the factory. What I did cuz I didnt want such an aggressive rear end (canyon/mountains) is measured the slack with the stock shims in place with a feeler gauge. so there was .20mm in slack and I added up the 1.13 shim size and added .10 more for stiffen it up and got 1.43... 1.13+.20+.10=1.43 and conveniently there is a 1.43 shim and went and ordered. I have only driven the car around the neighborhood with no chirping or ratcheting. Still need to go on a better test drive w/o a slipping clutch to get a better feel of this diff. plus I still have the other shim that I replaced and if needed to tighten up a lil more I can pop it in. Who else is running a different gear ratio on the J30 vlsds 3.96. I have the 4.08 ring off the open.
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