Swapping rears from one 3rd gen to another

Reply Subscribe

Thread Tools

Search this Thread

Feb 28, 2006 | 07:51 PM

vindoo

Thread Starter

Member

Joined: Dec 2005

Posts: 196

Likes: 0

From: Port St Lucie, Florida

Car: 89 Formula 350

Engine: 350 TPI

Transmission: 700R4

Swapping rears from one 3rd gen to another

I recently came across a Firebird Formula parts car, it has the Posi rear with 3.27 gears and disc brakes. I want to swap into my 92 Camaro RS that has the limited slip drum brake rear.

My question is it a direct swap? Will I be able to hook up my E brake properly and will I need any other parts?

I do realize my speedo wont work right anymore, any info on what I will need to set that up correctly?

Thanks in advance...

Feb 28, 2006 | 08:14 PM

1989GTABlown632

Junior Member

Joined: Jan 2006

Posts: 87

Likes: 0

From: PA

Car: 1989 Pontiac Firebird Trans-Am GTA

Engine: Blown 632 CID with Nitrous

Transmission: TH400

Axle/Gears: 4:10

1 thing your gonna need the brake booster setup or possibally a proportioning valve. The rear drums on your now take alot less brake pressure to apply than rear disks. When you hit your brakes you wont feel like you have any rear braking.

Last edited by 1989GTABlown632; Feb 28, 2006 at 08:17 PM.

Feb 28, 2006 | 10:04 PM

ShiftyCapone

Supporter/Moderator

iTrader: (7)

Joined: Feb 2001

Posts: 13,753

Likes: 560

From: Cincinnati, OH

Car: '90 RS

Engine: 377 LSX

Transmission: Magnum T56

Re: Swapping rears from one 3rd gen to another

Quote:

Originally posted by vindoo
I recently came across a Firebird Formula parts car, it has the Posi rear with 3.27 gears and disc brakes. I want to swap into my 92 Camaro RS that has the limited slip drum brake rear.

My question is it a direct swap? Will I be able to hook up my E brake properly and will I need any other parts?

I do realize my speedo wont work right anymore, any info on what I will need to set that up correctly?

Thanks in advance...

You will be fine. There are people who run LS1 rear brakes (larger than any 3rd gen brake offered) without any proportioning changes. The few 3rd gen cars that I have driven with drum to disk conversions (4th gen rears minus any proportioning) felt normal and had equal braking capability.