[96capricemgr]

You should understand that until you do the mods bluebowtie mentioned the rear discs will HURT braking in normal driving. GM did not bother to make a proper proportioning valve so the rear discs will barely function unless it is a panic stop.

I have had the 9.5" drums, the 11" drums and the discs all in the same car and in stock form as GM inteneded the discs are the WORST for normal daily driving.

I am sure people will argue that, but fact is GM delivered the disc cars with drum proportioning valves which deliver inadequate volume, and like I said I have had all three setups in the same car, meaning I have a bit more experiance at it than just about everyone who will say I am wrong. Even after putting a slightly bigger master cylinder in the discs were still a step backwards from the drums. The proportioning valve mods blue spoke of fix that though and make the proportioning valve function as it should for a disc rear car.

Again this is not a matter of grabbing the proportioning valve off the disc car, GM delivered them with drum valves. You could go ahead and grab the proportioing valve off the disc car so you have a spare one to modify though.