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 77 Trans Am Differential
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tombone1974
Sitting Bull

USA
174 Posts

Posted - 11 May 2014 :  03:05:00 AM  Show Profile  Reply with Quote
In my 77 TA I have a 2.41 geared 10 bolt posi rear. Maybe I am seriously over thinking this but when I "light 'em up" only one wheel spins and I thought that with a posi both wheels spin or is that only with a locker?

67drake
Sitting Duck

Azerbaijan
1501 Posts

Posted - 11 May 2014 :  07:24:30 AM  Show Profile  Reply with Quote
The clutches in the posi wear out over the years. When this happens it's basically a "one leg wonder".


71' GTO Original 400 M20 3.23 posi
13.95@102.1 MPH on street tires
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 11 May 2014 :  08:41:15 AM  Show Profile  Reply with Quote
Technically there are no "one leggers" as even a non limited slip drives both wheels equally...that is until traction goes away on one side.

Get an Eaton unit as GM clutches are non existent. A guy at PY was producing them (or talking about it) but by the time you buy them your half way to an Eaton. AND new clutches are available for the Eaton's btw.

Only problem you're going to have with any other carriers is they won't fit the 2.41 or 2.56 gear sets. They will be 2.73-up for the 8.5" corporate rears. But that opens up another avenue regarding a gear swap.

Another option is a used 2.41-2.56 L/S carrier or used clutches but that's a terrible option.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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bigD
Indian Spirit

USA
643 Posts

Posted - 11 May 2014 :  09:01:09 AM  Show Profile  Reply with Quote
http://www.ebay.com/itm/GM-8-5-10-Bolt-Posi-Gears-Bearing-Kit-28-Spl-3-08-/390528019568?pt=Motors_Car_Truck_Parts_Accessories&hash=item5aed48ac70&vxp=mtr
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67drake
Sitting Duck

Azerbaijan
1501 Posts

Posted - 11 May 2014 :  09:26:31 AM  Show Profile  Reply with Quote
Phil,there is a guy from NJ over on Chevelles.com that did a run of the 8.5 clutches,BUT they are $200 a set. Kind of hard to invest $200 in a 40 year old carrier when,as said,the Eatons are available,and have rebuild parts being made.
Steve,if you want,I have the clutch guy's #. He's a great guy,but up to you if you want to drop $200 on clutches.


71' GTO Original 400 M20 3.23 posi
13.95@102.1 MPH on street tires

Edited by - 67drake on 11 May 2014 09:32:56 AM
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 11 May 2014 :  09:38:40 AM  Show Profile  Reply with Quote
Drake, yes those may be the ones I mentioned from a fellow PY'er. That's why I think the Eaton is the logical choice since the $200 clutches are almost half way there. Besides, the GM units were junk compared to the Eatons.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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tombone1974
Sitting Bull

USA
174 Posts

Posted - 11 May 2014 :  5:06:48 PM  Show Profile  Reply with Quote
Eaton sounds good to me, can do gear swap at the same time. Currently running a mild 400 and TH350 until the 461 is complete then I will be installing the 461 and my tremic tko 600 5 speed.
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bnorris_74
Crazy Horse

USA
1442 Posts

Posted - 06 Jul 2014 :  07:18:28 AM  Show Profile  Reply with Quote
TTT
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