Are all 9 bolt housings the same ?
Thread Starter
Senior Member
Joined: Sep 2002
Posts: 987
Likes: 56
From: Nebraska
Car: '89 Formula
Engine: 355
Transmission: 700R4
Axle/Gears: 9 bolt
Are all 9 bolt housings the same ?
I know the brake hardware on the BW rear changed in '89, meaning different backing plates were required. Were there any other changes made throughout the model years or are all the 9 bolt housings the same?
Supreme Member
iTrader: (2)
Joined: Jul 2001
Posts: 1,823
Likes: 1
From: San Antonio, TX
Car: 1988 IROC-Z
Engine: L98 (350 TPI)
Transmission: MD8 (700 R4) + 3.42 LS1 Rear
on the 9 bolt the DRUM axle housing flange is different from the DISC axle housing flange.
examples......
86 DISC rear end housing will be the same as a 89 DISC housing. (just change backing plates & hardlines to swap to the newer brake system)
86 DRUM rear end housing will be the same as a 89 DRUM housing. (if there is a 89' drum setup on 9 bolts???)
examples......
86 DISC rear end housing will be the same as a 89 DISC housing. (just change backing plates & hardlines to swap to the newer brake system)
86 DRUM rear end housing will be the same as a 89 DRUM housing. (if there is a 89' drum setup on 9 bolts???)
Senior Member
Joined: Jul 1999
Posts: 931
Likes: 0
From: Mpls, MN USA
Car: 88 Camaro
Engine: 427 BBC
Transmission: T400
What specifically are you interested in knowing? All the 9 bolt housings are direct fit. The drum brake version is very uncommon. Other than that, they are all the same.
Miles
Diff Solutions
www.9bolt.com
Miles
Diff Solutions
www.9bolt.com
Thread Starter
Senior Member
Joined: Sep 2002
Posts: 987
Likes: 56
From: Nebraska
Car: '89 Formula
Engine: 355
Transmission: 700R4
Axle/Gears: 9 bolt
Ive got a '86 IROC rear w/ the sh*tty Saginaw calipers. (2.77 ratio) Im planning on swapping it into my '89 Formula and just switching the backing plates and PBRs onto the IROC diff. First, Ive got to get a carrier and 3.45s, cause the 2.77s just arent gonna cut it.
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