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Old August 14th, 2019, 05:52
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TRCM TRCM is offline
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Join Date: Jan 2007
Location: Newport News,VA
Posts: 1,194
Re: Pinion shaft not clearing ring gear.

Ok, to begin with, that's commonly called the center pin, not the pinion shaft.

And this is common with non-stock ratio gear sets, especially the higher ones (4.56, 4.88, 5.13, etc). I had to grind down a tooth about 0.040" on the ring gear to get the center pin in on another vehicle when I installed 4.56 gears.

What this shows is laziness on the part of the installer. Usually, you can rotate the ring gear so the space needed for the center pin is between gear teeth, but that requires checking for clearance which many don't do as it may require putting on and taking off the ring gear a few times. The fact that the center pin was ground for clearance confirms the lazy factor, as they decided to do that instead of doing it correctly.

If the center pin has been ground , it is weaker, even in a stock open diff, and that same pin cannot be used for a locking diff, as the pin diameter is a key part of how it all works.

Can you push the pin thru the other direction ?

If not, your only choice is to either remove the carrier and remove/reinstall the ring gear (which requires setting it up again), or grind that offending tooth down just enough to give you the clearance you need.



Last edited by TRCM; August 14th, 2019 at 06:24.
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