rear diff size

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May 20, 2006 | 12:35 PM

my1987z28

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Joined: May 2006

Posts: 24

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rear diff size

i need to replace axel seals on a 87 z28 -the parts guy said i need to know which rear size i have -what are some ways to tell the difference between the 7and5/8 rear and the 7and 3/4 rear??thanks

Last edited by my1987z28; May 20, 2006 at 12:40 PM.

May 20, 2006 | 12:41 PM

DJP87Z28

Supreme Member

Joined: Mar 2003

Posts: 4,771

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From: Florida

Car: 1987 Black IROC-Z (SOLD)

Count the bolts on the rear cover:
10=10-bolt 7 5/8 dia ring gear.
9 = 9-bolt 7 3/4 dia ring gear.
But my guess its a 10-bolt.

May 20, 2006 | 06:26 PM

8Mike9

Supreme Member

Joined: Jul 1999

Posts: 5,183

Likes: 42

From: Oakdale, Ca

Car: 89 IrocZ

Engine: L98-ish

Transmission: 700R4

I'm lazy, seals are cheap. Buy both sets, take your axle apart and return the ones you don't need.

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