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Old 11-20-2006, 10:36 AM
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Ring & Pinion Setup - GM 10-Bolt Help

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Doing my first ring & pinion setup now. I will be all set to go next week. It's a GM 8.5 inch 10-bolt with all new Eaton 30-spline posi, Richmond 3.90 gears, Moser 30-spline axles, installation kit, etc. I am having the pinion and carrier bearing pressed on by a local shop later this week. Then it's all up to me to install and setup the new ring/pinion.

I've never done this. I've read about it, watched a video, seen photos, learned about checking distance, backlash, etc. However I still don't know the sequential steps to get this done properly. I'm confused by a couple things.

Can somebody please provide me with a ordered sequence of steps to perform this setup. I have all the shims, tooth marking compound, etc to do the job, and yes I have a dial indicator. I am keeping the original pinion depth shim so I have a staring point for the pinion shim. The new gear set is marked with a checking distance "CD" but I don't know how to measure that exactly because I can't find the exact carrier centerline.

thanks.

Lee

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Old 11-20-2006, 10:42 PM
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Most likely get razz`d for this but to be honest with the 10 bolt 8.5 ring and 30 spline setups... I found that either a .030 or .032 shim on the pinion is normaly puts you in the ball park... Depending on the gearset which you mentioned is Richmond (wise choice) then the setup backlash is .008-.010 Also remember the lapping of Richmond gears you may end up with some noise and may never get it out but just get to point where you can live it with and understand those Richmond gears are tough...

I know someone else can provide what your really wanting the step by step procedure but what I just gave you is a day to day set of spec`s that has yet to fail me... Of course check your pattern real close...

One little tip if your unsure of things and want to be good to go just get another inside pinion bearing and use a die grinder with a flap sander (otherwise known as a chicken plucker) and take the press fit out of the inside of the bearing so it will just slid on the pinion shaft... This allows you to change shims as needed if your housing is a little off or machined different... Also use your old pinion nut till your ready for final assembly...
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Old 11-21-2006, 04:34 PM
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Quote:
Originally Posted by Bumpstick
Most likely get razz`d for this but to be honest with the 10 bolt 8.5 ring and 30 spline setups... I found that either a .030 or .032 shim on the pinion is normaly puts you in the ball park... Depending on the gearset which you mentioned is Richmond (wise choice) then the setup backlash is .008-.010 Also remember the lapping of Richmond gears you may end up with some noise and may never get it out but just get to point where you can live it with and understand those Richmond gears are tough...

I know someone else can provide what your really wanting the step by step procedure but what I just gave you is a day to day set of spec`s that has yet to fail me... Of course check your pattern real close...

One little tip if your unsure of things and want to be good to go just get another inside pinion bearing and use a die grinder with a flap sander (otherwise known as a chicken plucker) and take the press fit out of the inside of the bearing so it will just slid on the pinion shaft... This allows you to change shims as needed if your housing is a little off or machined different... Also use your old pinion nut till your ready for final assembly...
excellent information there Mr. Bumpstick. thank you very much. that will help me a lot. I will do what you said, and that trick with honing out the old bearing and using it just for the setup is a great idea.

Lee
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Old 11-21-2006, 08:02 PM
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Thanks and here is another bit of info that might help ya...

http://www.drivetrainspecialists.com/setupspec.html
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