capriceowns

Im looking for a Posi unit with 3.42 gears to replace my 2.56 limited slip.

I heard that the S-10's had posi and that gear size. Do they? are they any codes I can get to tell one from another?

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1987 Chevrolet Caprice classic Brougham. 142,000 on the 305 and still chugging

blazee

Look at the RPO list in the glove box of the donor vehicle. You'll want to look for G80 (locking diff) and GU6 (3.42).

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capriceowns

What wll I need out of the rear end to make mine a 3.42 posi? Its for my 87 caprice. its getting a engine buildup and i need posi with taller gears.

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1987 Chevrolet Caprice classic Brougham. 142,000 on the 305 and still chugging

maxwedge

Ring and pinion, is the diff the same as a Caprice, make sure first,

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GMMerlin

Posi - limited slip...same thing
Best bet is to buy a new ring and pinion.

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