Posi unit help - Pontiac GTO Forum
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post #1 of 22 (permalink) Old 01-21-2016, 01:08 AM Thread Starter
 
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Posi unit help

Hey guys I have an original 8.2 with 3.23 open rear end in my 69' GTO.

I'm in the middle of a chassis/engine rebuild and the one tire spin no traction has got to go! Seriously impossible to get traction off the line even with the 47 year old 400.

I hear bad press about Auburn so I looked into Eatons posi unit but it's not offered for anything less than 3.55. I want to keep my 3.23 gear ratio as my engine build (which could be delayed big time cause of our embarrassing Can. dollar) will be for street driving.

Has anyone had an Auburn installed? Results? Or is there another way?

Btw it's an original car so I plan to keep it that way. Not concours but I sure ain't putting a Ford rear in her!
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post #2 of 22 (permalink) Old 01-21-2016, 08:52 AM
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I installed an Auburn unit, 3.55 what is what the car was born with. Been several years, no issues at all.
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post #3 of 22 (permalink) Old 01-21-2016, 02:35 PM Thread Starter
 
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Good point Rukee.
My car won't be hammered on until one of those Dodge ram guys pull up to a set of lights. Lol

Who did you order yours from?

It's a good thing the Auburn is cheaper cause right now I'm paying next to $500 on every $1000 USD.
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post #4 of 22 (permalink) Old 01-21-2016, 05:41 PM
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I believe I bought it from SUMMIT Racing.com.
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post #5 of 22 (permalink) Old 01-21-2016, 07:41 PM
 
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Also you can check Randy's Ring and Pinion. They are a National outfit, got a location near here, lots of Auburn, Yukon, Dana,....you name it.

They have a good enough and huge mail order business, lots of off road era, and good techs....
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post #6 of 22 (permalink) Old 01-21-2016, 07:53 PM
 
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A few years ago the Muncie in my '67 gave out. Got it rebuilt. 3 weeks later my peg leg 3.23 gave out. Got a 3.55 Auburn locker. 3+ years now and no issues.
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post #7 of 22 (permalink) Old 01-21-2016, 08:33 PM Thread Starter
 
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Cool. Thanks guys
PJW you say an Auburn locker? Do you mean a clutch posi unit or the locker style gears that 4x4 guys use?

If the it's posi unit then it sounds like I'm definitely going for the Auburn, hopefully there's not too many off shore parts?!? Definitely prefer Made in America but that's hard to find nowadays.
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post #8 of 22 (permalink) Old 01-21-2016, 09:12 PM
 
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Quote:
Originally Posted by Wendt69 View Post
Cool. Thanks guys
PJW you say an Auburn locker? Do you mean a clutch posi unit or the locker style gears that 4x4 guys use?

If the it's posi unit then it sounds like I'm definitely going for the Auburn, hopefully there's not too many off shore parts?!? Definitely prefer Made in America but that's hard to find nowadays.
Locker was how the shop described it but it's likely just a posi. Let me dig out the receipt.
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post #9 of 22 (permalink) Old 01-21-2016, 09:26 PM
 
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When the Eaton 8.2 Pontiac carriers were introduced in the early 00's, there was a mid ratio (2.93-3.08-3.23) carrier, and a low ratio (3.36-5.57) carrier. Unfortunately, over the last 4-5 years, it's been near impossible to come up with an Eaton Pontiac 8.2 carrier in the mid ratio design. Over the years I've ordered several of the Eaton 8.2's along with several of the Auburn Pro Series Pontiac 8.2 carriers. Nearly all were installed in nodular 8.2 Pontiac 10 bolts. Both are a better design if the nodular 8.2 is getting hammered on. Short of that abuse, one can get by with the standard Auburn cone type carrier.

In a position, where Pontiac 8.2 center housing is just a std gray iron 8.2, the sealed bearing axles need replacing, and one is interested in swapping in a posi and/ or gears for a performance build, blowing the bank on building up the gray iron 8.2 is a total waste of funds. Much easier and less expensive to have a HD 8.5 A body rear built.
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post #10 of 22 (permalink) Old 01-21-2016, 09:31 PM
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Doesn't the locker for the 4x4's have a wire going to them that the driver can flip a switch and "lock" the rear/front diffs into posi?
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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