g body rear disc problems

[big gear head]

I'm working on a customer's '84 SS Monte Carlo. I built an A body 12 bolt for it to the stock G body width using the G body lower controll arm brackets and shock mounts. The rear end bolted in just like it should, but now I'm having problems putting disc brakes on it. I've tried a Master Poiwer kit and a Wilwood kit and both of them are hitting the frame. The Master Power kit parking brake brackets are directly under the frame about 2 1/2 inches and the Wilwood parking brake bracket puts the cables against the frame, and the calipers might hit the frame if the body leans. Has anyone else had problems like this and what kit works that will not hit the frame? Thanks for your help.

[axisg]

I installed the LS1 rear brakes on my 84 and they cleared the frame but just barely. Once installed we removed the rear springs and jacked up the rear until it bottomed out just to see what hits. The suspension hits the bumpstops about an inch before the caliper would hit the frame so I would imagine that if the car had soft rear springs then the calipers would hit the frame during hard cornering. I chose to install new stock cargo springs in the rear and have not hit yet but I can see where the bumpstops have contacted the frame so I know I am close. With that in mind any of the "lowered" guys I spoke to have had to notch the frame to install rear disks and make clearance for the calipers. You can see in the pic below just how far in-board the caliper comes ( regardless of the setup used ). There really just isnt much room there. Clocking the caliper to the rear of the car ( instead of the front like mine ) helps a little but then you run interference with the shock mount

[Apogee]

Clock the calipers to the rear and then relocate the shocks seems to be what many guys do, others choose to notch the frame or some combination thereof. As stated above, there really isn't much room on those applications, so short of running a wider axle (flange to flange) and more backspacing on your wheels, there isn't any other way to push the brakes out any.

Tobin
KORE3

[big gear head]

Thank you for the replies. Now I know that I'm not the only one that's had this problem. I'll have to look into these options and see which way I need to go.

[BulldawgMusclecars]

Pull up my Project Grocery Getter build thread; I used LS1 brakes on it, and mounted the calipers at the rear. All I had to do was re-drill the shock mount slightly inboard, and there was enough clearance. That was with an 8.5 10 bolt.

[MonzaRacer]

or S10 2wd might help issue

[big gear head]

I have Baer's Sport (11"?) rear disk with E-brake on my 84 Grand National and love them. No interference problems and a working emergency brake!
Conrad

That's the kit that we are trying now. What cables did you use?

[big gear head]

I'm not ordering the kit, I'm just installing it. I'll have to see if it comes with cables. They sent one of the backing plates with the parking brake assembled so that I could see if it would clear the shocks. The arm that sticks out the back side to activate the parking brake will not work with the stock cables, so I know that something else will have to be used.