rear drum to disc brake

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08-20-2004, 11:06 PM

catc

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Car: 1985 Trans Am

Engine: Chevrolet 355

Transmission: Borg Warner W.C. manual cog

Axle/Gears: B W 9-bolt 3.45 Limited Slip

rear drum to disc brake

Does anyone know if the rear axle housings for drum (85)and discs (89) are the same so if one wanted to change to discs its a simple swap and would it be best to change proportioning valves?

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08-20-2004, 11:13 PM

ebmiller88

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Car: '88 Iroc, '91 RS, and a '70 RS

Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag

Transmission: A4, A4, slated to be a T56

To answer your question: No.

Search my man, search...

https://www.thirdgen.org/newdesign/t...reardisc.shtml

and

http://members.fbody.com/86firebird/ls1/ls1brakes.htm

There's more out there...

Ed

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08-21-2004, 08:16 AM

novass

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Car: 1990 Formula

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Re: rear drum to disc brake

Quote:

Originally posted by catc
Does anyone know if the rear axle housings for drum (85)and discs (89) are the same so if one wanted to change to discs its a simple swap and would it be best to change proportioning valves?

No there not like ed said, however, the swap using that info is not all that bad. I did the LS1 rears and they are great!

I put in a new 4 wheel disk 1LE
valve, however, my part # wont work for you because mine is a 90.

pics: