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Why do you believe you need disc brakes out back. The front ones do most of the braking so a well maintained set of drums out back are usually sufficient.
If you really want rear disc brakes then you can swap rear ends with a continental or other large car that had rear discs. I know for my '68 Mustangs the rear end from a Mercury Monarch will bolt right in. In fact I bought one a couple years ago and haven't installed it yet. I measured my Mustang from spring perch to spring perch and overall width. The Monarch's rear was identical so I bought it.
Another option is to install a Baer Claw or other aftermarket disc conversion. They are designed for the Ford 9" so they bolt right on. Keep an eye on Mustang magazines at the news stands and eventually one will include the conversion for you to see what it takes. These conversions are designed to handle the riggors of racing so slowing a laden truck shouldn't be a problem. They also include a small drum brake (inside the caliper) on one side which is your parking brake.
I also remember seeing an article on installing the rear disc brakes from an early Explorer on a Mustang's 9". My memory is foggy on that one so you better research it. If this is true then it would be the easier and cheaper of the conversions.
I guess I just want to tinker, Bruce. Actually, I am customizing this truck and just liked the idea. One reason is to change all the brakes with the same pads. I have rebuilt the drums and they work very well. No problem with that. Just like to know all the possibilities. Thanks for the reply.
Rick
Rick I have 2 97 Taurus' The car that I drive is 4 wheel disk, and the one that my wife drives is 2 and 2. I really do not see any advantage in the 4 wheel disk. As a matter of fact with the ALB system I like the 2 2 better, it stops smother.
If you look most cars use 2 2 rather than 4 wheel disks. I think one thing for sure, it will cost you a lot of money to change the rears to disk and where will you get your replacement pads and rotors?