9 or 10 bolt
Thread Starter
Joined: Mar 2010
Posts: 989
Likes: 9
From: tn.
Car: 1990 firebird,1989 Iroc z,1986 fire
Engine: 3.1lt,5.7tpi,3.1mpfi
Transmission: auto,auto
Axle/Gears: 273?277
9 or 10 bolt
OK I read on the 10 bolt rearend.I still don't get it.I've got a 86 with a 2.8 and a 90 with a 3.1.Should I have a 9 in the 86 and a 10 in the 90?
Supreme Member
Joined: Mar 2003
Posts: 4,771
Likes: 15
From: Florida
Car: 1987 Black IROC-Z (SOLD)
Re: 9 or 10 bolt
With the V6's, you will have the stock 10-bolt rears. Two different GM sources for the rear axle assemblies. Both have parts that are not compatible with each other. So the number of bolts on the housing cover was a quick way to identify them.
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