'89 Z posi rear end

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Dec 4, 2000 | 08:49 PM

TexasLT1

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Joined: Oct 2000

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From: Angleton, TX

Car: '92 RS

'89 Z posi rear end

alright, a friend of mine gave me the rearend out of an '89 Z with Posi-trac and 3.73 gears. only problem is that one of the axles was missing. I've got a '92 RS that came with the 305(LB9?) and 3.08 rear end. am I going to have any problems with the axles mating up? there are a couple of rustangs hanging around town I need to beat and I really want to put that rear end in. thanks for any help

Dec 4, 2000 | 08:55 PM

TexasLT1

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Joined: Oct 2000

Posts: 3,819

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From: Angleton, TX

Car: '92 RS

forgot to add something else, I want to put the posi into my original axle housing because the one he gave me was pretty rusted. the assembly he gave me also had disc brakes, will there be any problems putting my drums on the other axles?

Dec 4, 2000 | 09:54 PM

lonsal

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From: Hacienda Heights, CA

Car: 90 RS 'Vert, 88 IROC-Z, 88 Firebird

Engine: 305 ci tbi, 305 ci tpi, 350 ci tpi

Transmission: WC-T5, WC-T5, 700R4

Axle/Gears: 3.45, 3.27, 3.27

The 9-bolt has a completely different axle than the 10-bolt. The only thing common to both rear ends internally is the gear oil. If you want to use the 9-bolt you need to get a new axle for it. Also you can't swap the discs from it to your 10 bolt drum rear end. Sorry, Lon.