pinion bearing shim

T

tallpaul

New member
A friend of mine pulled the old bearing off of my old pinion to see what size shim I would need on my new pinion. I am keeping the same 4.10 gear ratio. We thought that there was only one shim b/n the bearing and the back of the pinion. There were two shimes that he measured at .035 each. He wanted to know if there should be two and what the total thickness should be. The old gears had gear whine on the coast side, so I don't know if we should add more shims or take some away. We haven't installed the gears yet, so we haven't seen the gear marks on the ring gear. I would appreciate anyones .02 worth.
 
the factory is one shim aftermarket is different thickness shims so there might be more than one to get the right thickness for the pinion depth
 
You need to measure the installed pinion depth. Requires special tool. if you are using the same pinion you could use the same shims.
 
The thickness if the shims (pinion and carrier) determines how the gears mesh together and that will determine if you will have noise. I'd suggest taking it to someone who knows what they are doing.
 
When I had my 4.10s installed the person who did the install prefered to use the factory one piece shims instead of the several slim ones. Took him a little extra time to get all dialed in right but worth it.
 
ctrlraven said:
When I had my 4.10s installed the person who did the install prefered to use the factory one piece shims instead of the several slim ones. Took him a little extra time to get all dialed in right but worth it.
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When the guy that installed my 4.10's used the factory shims he found the pattern dead-on. Used Ford Racing gears. Yours maybe different.
 
.070" is way to thick. .035" is what i have in my 4.10 right now. if you don't have the proper tools than start with .035" and work from there
 
fastblackmerc said:
I'd suggest taking it to someone who knows what they are doing.
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I just did that (took it to someone who does it every day) and, viola, not a lick of whine on coasting. It was such an improvement that I now can actually hear how bad the reception in my stock radio really is!
 
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