So need a 373 posi for a 7.5. Helping a friend with a low budget build 84 cutlass. Has a 307.

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hunter_alexander

Master Mechanic
Apr 29, 2008
298
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Erie Pa
Same as the title, helping a friend do a low budget build, we pulled the rear out today. He wants a posi and a 3:73. Used is fine but has to be in working order.
 

Yav8

Master Mechanic
Aug 19, 2014
275
114
43
Manitowoc wis.
26 spline early S10 4 wheel drive. 4 cyl auto or stick. 28 spline same set up but 1990 and up. most of the 4 wheelers were posi most 4cyl ones were the lowest ratio.
 
Oct 14, 2008
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They will probably be the Gov Bomb posi in the S-10's but they should be fine behind a stock 307.
 

gbodysupreme

Not-quite-so-new-guy
Jun 26, 2015
32
10
8
Pittsburgh, PA
I did a relatively inexpensive build on my 7.5, 26 spline axle a few years ago. Gutted my case and installed an Auburn Gear 3.73 ring & pinion, Auburn stage 2 limited slip carrier and a bearing kit for about $700. I'm sure everything has gone up in price, but including junkyard axle cores.
 
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Ugly1

Royal Smart Person
Oct 26, 2021
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Lost in the woods of NH
Correct. Neither did all of the S10's. But there are deals on 3.73 posi Monte SS rears that pop up from time to time.
Best I got was I got a whole ElCamino for parts and the yard had no idea that it had a 3:42 posi that had gotten rebuilt in it. Paid $600 sold some parts from it saved the rearend total cost $200😎
 
Oct 14, 2008
8,806
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Melville,Saskatchewan
Yeah, most Astro Van's are 3.23 open. The Wrecker had to open quite a few to get 3.42 gears and still open.
 
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