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Old 08-07-2011, 06:58 PM
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7.5 limited slip - to posi options?

Here is my deal. I recently bought a buick regal with a V8. I Pulled out the 307 V8 and installed a Fully worked Turbo V6 Grand National Motor. Now the car has a 7.5 one tire fire rear. I can't afford what the 8.5 342 GN posi's are going for. So i have heard i can install a auburn posi unit from a camaro. What are some realistic options. I think my axels are 26 spline. And does the 7.625/7.5 matter or will they both work.....I am looking for maybe a 373 gear size.

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Old 08-09-2011, 04:25 AM
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Go to a junk yard and see about a 12 bolt, freshen it up, then drop it in.

Hate to say it, but putting gears and a auburn posi into it won't really fix any problems, I've seen plenty of 7.625 10 bolts shredded inside. Once you fix it so you get traction the stress starts building then its a matter of what's going to give.
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Old 08-09-2011, 05:35 AM
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FYI positraction is Gm's name for limited slip. One wheel peel is reffered to as an open differential.
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Old 08-11-2011, 04:52 PM
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And the Auburn posi units are not worth their weight in scrap metal. Don't waste your time going that route.

Look for an Eaton posi for the 7.5" like this:
http://cgi.ebay.com/ebaymotors/19663...item53e88c4c04

DO NOT BUY the Eaton Gov-loc style posi as it will unlock at around 20MPH, leaving you spinning just one tire. It will do this a couple times before it blows up leaving you PERMANENTLY with a one-wheel pealer again.

You could always buy a Lok-Right.. Or just run a mini-spool.

You can sometimes find used Eaton Posi's for much less than the one I posted. You just have to keep looking.
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Old 08-12-2011, 02:58 PM
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Replacement limited slip differentials for a 7.5" GM rear.

The aftermarket Auburn Gear limit slip differential works very very well. No problems. The Eaton "Posi" limited slip differential work very well too.

If you are not changing the gear ratio. You will need to reset the gear backlash and side bearing preload. You will need a dial indicator and magnetic stand. Its not that hard.

Either one will likely out live you if installed right.

Never buy a "Used" posi. A posi is removed and sold for only one reason.

Buy new.

http://www.auburngear.com/

http://www.eaton.com/EatonCom/Produc...tials/PosiLSD/

Last edited by F-BIRD'88; 08-12-2011 at 03:04 PM.
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Old 08-12-2011, 08:01 PM
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the g80 sucks in stock form true but it can be modiified to stay locked past 20 mph by cuting down the weight to where it dont disengage,also theres a clutch spring preload kit that can be used instead of the gov mechanism
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Old 08-16-2011, 10:21 PM
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I think the Camaro Diffs are 28-spline but, a used set of GN/T-Type 8.5" axles will work in the 7.5"/7.6" Housing.
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Old 08-17-2011, 06:18 AM
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The Camaro - Firebird 7.5" rear 26-28 spline axle crossover year is 1988.

This year you can find either or. Mine was 26 spline.
The Eaton and Auburn Differentials are available in both 26 and 28 spline for the 7.5"
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