Im currently replacing my ring and pinion in a gm 7.5". How do I go about setting my pinion depth? My boces teacher and i have spent three days trying to figure it out. I think we're close but i need an extra person to help out
Replacing ring an pinion help please!
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Yeah we tried looking everywhere. I have an original 1979 chassis manual that basically goes over everything in the car and amazingly it doesn't have pinion depth.olds307 and 403 said:
Are you using new gears or are they from another rear end. If they are from another rear end then the pinion will be shimmed to be at the right depth. The depth is measured by the pattern on the crown gear and it's adjust by the shim under the bearing. You need a bearing that is ground so it slides on allowing you can change the shims easily to get your set up. You have to assemble the rear using the old crush sleeve to check the depth each time you change the shim. Once you have the right shim then you can install a new bearing.
If you don't have the set up tooling to measure the housing, The shim is per housing, you can always use the old shim from under the old pinion bearing. You will find that it is usually within a couple of thousands of an inch. I always would measure the housing and compare to the shim I removed. Last but not least check the pattern after aquiring correct backlash. .008 to .012 Depending new/used gear set for street use. It's been a while but I think I am remembering correctly. I hope this helps.
The correct way is to use a pinion depth checking tool that mounts where the carrier bearings are located. It measures from the axle center line. But I have to agree with crazy87 that every one I ever checked was within one or two thousandths of the factory original. The carrier bearing shims are a whole different ball game and I have NEVER seen the original shims be correct for a different gear/bearing set or carrier. It looks like this.
79cutlasssalon442 said:
I would phone around to get a price to have it done unless you plan to do more rear ends in the future. You need a press to get the new bearings on and other tools you might not use again. For the crush sleeve it takes around 300 lbs torque.
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