9 bolt disc barake conversion in drum brake car questions

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Feb 20, 2007 | 04:11 PM

camaro8tysvn

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Car: 87 camaro

Engine: 355ci

Transmission: richmond 5 speed

Axle/Gears: 3.27

9 bolt disc barake conversion in drum brake car questions

i have a 87 camaro that as orignially a v6 10 bolt drum brake rear. i just bought a 9 bolt posi with disc brakes. can i put the drum brake set up from my 10 bolt on it or do i have to set up my car with the discs and if i set my car up with discs what else do i have to do for the conversion. its an 88 9 bolt

Feb 20, 2007 | 05:49 PM

Wadebryant

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Joined: Jul 2003

Posts: 1,236

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From: KY

Car: 87IROC, 740iBMW, 328iBMW, 86GMC

Engine: 5.7, 4.4LV8, 2.8, 6.0

Transmission: Manuals & Auto's

Axle/Gears: 3.27, 3.42

You cannot use the drums on the 9 bolt. Hopefully, you have the calipers too?

There are many posts related to this swap.

You will need the correct porportioning valve for proper front / rear braking bias. Check with your GM parts dealer to see if the master cylinder is compatible with the year of 9 bolt rear end that you have. Also, you'll probably need new e-brake cables.

Good luck

Feb 20, 2007 | 07:17 PM

camaro8tysvn

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Junior Member

iTrader: (1)

Joined: Apr 2006

Posts: 27

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Car: 87 camaro

Engine: 355ci

Transmission: richmond 5 speed

Axle/Gears: 3.27

could i get an adjustable porpotioning valve like from jegs and bypass the stock porpotioning valve

Feb 20, 2007 | 08:40 PM

1989formula355

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From: haverhill MA

Car: 89 formula, 89 Cadillac Brougham

Engine: 355,HSR,patriot alum. heads,TFS cam

Transmission: 700r4, 2500 B&M stall, shift kit

Axle/Gears: 3.73 ten bolt, powertrax locker

yeah, you can bypass the stock one and use the jeg's unit. i replaced my worn 9 bolt posi disc with a 3.73 10 bolt locker drum, and i didn't bother to change the valve. no complaints, pedal feels fine and stops good and straight.