What rear differential should I have in car

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Jul 10, 2012 | 08:15 AM

77oldsprostreet

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Posts: 6

What rear differential should I have in car

I just bought a 1976 Olds Cutlass Salon with 350 rocket motor, what rear differential should be in this car from the factory

Jul 10, 2012 | 10:07 AM

1970cs

Lansing built

Joined: Nov 2011

Posts: 3,330

From: Grand Ledge, MI

I am assuming that you have an automatic? If so 2.41 is standard GU1 code except Z95 code
available 2.56 GM8, 2.73 GU2 and 3.08 GU4. Assuming again that it's Olds/Buick differential

Source Wildabout cars.

http://wildaboutcarsonline.com/membe...2_1-4Z_3.p.pdf

Jul 10, 2012 | 05:24 PM

77oldsprostreet

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Posts: 6

What I meant was wether it was a 10 bolt 7.5 rear or 10 bolt 8" rear or something else

Jul 10, 2012 | 07:06 PM

ihengineer76

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Joined: Jun 2012

Posts: 251

From: Janesville, WI

10 bolt 8.5 inch. You can make sure by looking at the bottom of the differential and see if it has two squared off ears cast into it. There are a lot of pictures of this if you google it.