Join Date: Sep 1999
Location: San Diego, CA
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Re: O/T GM 10 bolt drum to disk swap
I did this last year on the wife's suburban (it's a '96). My whole swap was under $150. Here's what I did:
-take off existing brakes including backing plates. I cut the backing plates off so I wouldn't have to pull the axles. I couldn't remember if the axle has C-clips or not.
-I welded some caliper brackets to the housing tube. This is the best part. The right position was up against the flange for the drum backing plate. This made it really a lot stronger. I bought the brackets from AA manufacturing for under $20 shipped. They are already cut and tapped for chevy calipers.
-I found some 6 lug rotors that with basically the right dimensions. It cross references 86575. They are:
11 11/16 diameter
6 on 5.5" pattern
-I had to grind down the axle shaft flange for the rotor 'hat' to fit over. There was still plenty of meat for the lugs. This sounds wacky, but I jacked up one side at a time, put it in gear, instant 350 cubic inch fuel injected lathe. It makes for a good story. (jack up both sides if you have a locker or even LSD)
-I used the Caddy El Dorado style calipers sourced from a U-Pick-it lot for $25. These are the same as I have on my Jeep, and is the same caliper that's going on a ford 9" in my falcon. 3 vehicles, one set of spare pads.
-I got caddy parking brake cables to where they connect to the single cable and spliced to the suburban cable.
I hated working on the drums. The discs are almost too easy. Under normal driving conditions, I don't notice much diffence. When towing I notice a huge difference (much better). I still need to see if one of the newer master cylinders for 4wheel discs will work. It should firm up the pedal a little. It's fine, but not quite as firm a before.
I'll see if I can dig up some pics.
Here's the breakdown:
rotors $40 (pair)
pads $7 (they charged for them since they looked brand new).
brake cable $10
brake hoses $35
caliper brackets $20