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Old 05-01-2013, 11:40 AM
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Ring and Pinion Break in oil ?

Hey everyone,

I'm getting my new ring and pinion installed and was wondering what the proper break in oil is?

Its a GM 12 bolt with Posi, 3.73 gears installed. My plan was to run it with 80w-90 for the first 500 miles, then change it to synthetic 75w-90.

One other question, should I run the posi additive if its not making any sounds?

Thanks

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Old 05-01-2013, 11:41 AM
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Sounds like a good plan. You can try it without the additive and put it in later if it needs it.
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Old 05-01-2013, 07:11 PM
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Quote:
Originally Posted by big gear head View Post
Sounds like a good plan. You can try it without the additive and put it in later if it needs it.
What he said...
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Old 05-01-2013, 09:12 PM
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fyi,Ive never had a 12 bolt that didnt need the additive. Have fun with the new gears
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Old 05-01-2013, 11:58 PM
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Hi
You don't need to start off with regular gear oil,
you can use synthetic from the get go, & if you use
either Amsoil or Lucas you wont need to use the additive
as limited slip friction modifiers are already in there.
I'd use 75w/140
Rich
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Old 05-02-2013, 10:10 AM
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I'm re-gearing my 9" with Yukon stuff from QuickPerformance. Their rep said never to use synthetic on new gears...

Russ
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Old 05-02-2013, 11:32 AM
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I know its not R&P related but when we build a gearbox from scratch, we recommend the initial break in be done with mineral based (ie non synthetic) 75w90 GL4

I imagine that it would be the same for the R&P sets
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Old 05-02-2013, 08:03 PM
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All the gear sets we do in my shop,all state to NOT use synthetic on break in,I always use a mineral based oil as recommended,even the "Cup" guys have told me they break theirs in with mineral based oil,been doing it that way for close to 30 yrs.With all these cheap crappy foreien gears,break in is critical
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