Originally posted by turbofish38
I dont know of a 12" drum with a 4.75 bolt pattern. All GM 12" are 5X5". Now you can put 11" drums but I wouldn't recommend it with a stock 8.5 TR axle. If you cut the flange like John says you remove 50% of the backing plates clamping area. And the little 8mm bolts that are there are IMO to small for anything and there isn't enough meat on the flange to put anything bigger. I run 11" drums on the back of my GN but I am also running a different axle set up so they fit properly. Good luck if you do manage to accomplish this with a stock axle as you'll be able to powerbrake your car past 20# of boost on the line without the wheels breaking loose.