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Post Info TOPIC: Rebuild Stock 87 Monte Carlo SS Rear Differential
JMD83


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Date: Apr 19, 2012
Rebuild Stock 87 Monte Carlo SS Rear Differential
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Little help here...

My 87 Monte SS Aerocoupe is going under the knife and the Rear End will be dropped and practically out. Wondering if there is a rebuild kit out there for the factory differential. Does it use a clutch pack that can be serviced? Do I need to get an entire new unit from Eaton of Auburn? What RPO code tells me if I even have POSI?

I tried a search but couldn't find these specific answers.

Thanks for any assistance out there!

-Jose



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The stable; 1987 Monte Carlo SS Aerocoupe 1983 Trans Am
firebird_1252


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Date: Apr 19, 2012
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G80 is posi. the only thing you can do is drain the oil. but if it is G80 (and has the tag on the diff) you MUST USE THE GM POSI ADDITIVE.

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87 GN- in the process of being taken apart for a very long resto. 2011 Jeep Liberty
PitchBlackSS


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Date: Apr 19, 2012
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jack up back of car and spin a wheel. If they both go the same direction, you have a posi, if they go opposite, you have an open diff

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twomanymontes


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Date: Apr 20, 2012
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NAPA Does have a complete bearing set for the rearend. Just need to find an intelligent parts guy to look it up. If you have a posi unit, it can be rebuilt, but make sure you get GM clutches, the aftermarket ones don't hold up.

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JMD83


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Date: Apr 20, 2012
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twomanymontes wrote:

NAPA Does have a complete bearing set for the rearend. Just need to find an intelligent parts guy to look it up. If you have a posi unit, it can be rebuilt, but make sure you get GM clutches, the aftermarket ones don't hold up.

 I'm being told the G80 Auburn Posi unit is not rebuildable...? Is the dealer the only place to get the rebuild clutches?



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The stable; 1987 Monte Carlo SS Aerocoupe 1983 Trans Am
firebird_1252


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Date: Apr 20, 2012
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the gm unit is NOT rebuildable. thats why a lot of people do the eaton. then again.. if your upgrading the rear just go to the 8.5 gn rear.

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87 GN- in the process of being taken apart for a very long resto. 2011 Jeep Liberty
twomanymontes


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Date: Apr 21, 2012
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I have seen the guys at the dealership rebuild posi units, Maybe they were not for the 7.5 rear end, not sure. But I have spoke with a few techs that all say the after market clutches are junk.

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