4 gen. rear end

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Aug 23, 2010 | 07:33 PM

bradpower

Thread Starter

Junior Member

Joined: Apr 2009

Posts: 7

Likes: 0

From: bellevue ne

Car: 1989 formula ws6

Engine: 350 tpi

Transmission: 700r4

Axle/Gears: 1993 posi 10 bolt with 3:42

4 gen. rear end

i just bought a 10 bolt rear end rebuilt for 150 to replace my broken 9 bolt is the fourth gen posi this year really an improvement i tried to find some info off this part number but could not find anything useful the year and code is 1993 GM n #26029188

Aug 23, 2010 | 08:31 PM

gsf-87IROC

Member

Joined: Oct 1999

Posts: 358

Likes: 1

From: Southern Indiana

Car: 87 IROC-Z

Engine: 383 HSR $8D

Transmission: T56

Axle/Gears: 3.42

Re: 4 gen. rear end

Try punctuation....that would be an improvement.

/smart *** mode...

10 bolt will be easier to find parts for and have cheaper parts. Improvement? Probably not...much worse...probably not.

Last edited by gsf-87IROC; Aug 23, 2010 at 08:34 PM. Reason: Decided not to be quite so much of an ***.

Aug 23, 2010 | 11:25 PM

camaronewbie

Supreme Member

Joined: Sep 2002

Posts: 9,192

Likes: 19

From: Cary, North Carolina

Car: 1992 RS

Engine: Carbed 350

Transmission: 700R4

Axle/Gears: 3.42 posi

Re: 4 gen. rear end

The only way to know for sure is to take the cover off and look. Then you can verify gear ratio as well. It surely won't hurt anything to get new fluid in it since it's 17 years old.

Aug 24, 2010 | 08:08 AM

gsf-87IROC

Member

Joined: Oct 1999

Posts: 358

Likes: 1

From: Southern Indiana

Car: 87 IROC-Z

Engine: 383 HSR $8D

Transmission: T56

Axle/Gears: 3.42

Re: 4 gen. rear end

You can also just spin the pinion yoke and count the revolutions of the axle. It will get you a rough idea. You'll be able to tell between 3.42 and 2.73 which tells you which carrier size you have. Also, you can tell between 3.42 and 3.73s. 3.23s and 3.42s was the other standard option...not sure you'll be able to tell the difference.