I finally got my rear disc brakes installed from a '95-'01 Explorer. Don't flame me here, it was the best solution I could find for a setup with a parking brake and clearance for the caliper without a lot of modification to the chassis. There are complete new assemblies available through Ford, Currie Enterprises, and Strange Engineering, but I picked up a well-used set off eBay for $50.
Naturally, the backing plate is drilled for a Ford axle housing, so I made a drill jig out of an old c-clip eliminator so I could change the mounting pattern to GM (the hole in the backing plate is 3.150", so the bearing in the eliminator centers the jig):
Drilling backing plate.jpg
On the right is the undrilled backing plate, on the left is the plugged and redrilled one:
Drilled vs undrilled.jpg
My car has an axle assembly from Strange Engineering using a Ford-style pressed-on bearing with a Chevy-pattern housing end, so I needed to accommodate holding the axle in place as well as mounting the backing plate. Here are all of the parts. Since the Explorer assembly is made for a 2-1/2" axle flange spacing and the Chevy is 2-3/4", I needed a 1/4" spacer between the backing plate and the housing. Plus, with the axle I have, I needed to have fabricated a spacer (thanks Vega Craig!!) for the extra thickness of the backing plate so the bolt flange will press on the bearing as well as the backing plate. This wouldn't be necessary with a c-clip axle.
Parts.jpg
First, the spacer is installed against the housing flange (I used flange plates from Strange Engineering, S-10 Warehouse on eBay sells 1/4" spacers, as well):
Assembly 1.jpg
Next, the backing plate (note: I switched the backing plates side-to-side so the caliper will mount low and the e-brake cables are on the underside like the drum brake cable mounting):
Assembly 2.jpg
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