1966 Disc Brake Conversion Questions

You don't need new upper control arms if you use a set of ball joint adaptors from Dr. Diff, which I included in my total. Can order them here


And I'd be surprised if there wasn't a F/J/M body in a lot near you, 5th ave's, diplomat's etc had the right spindles all the way up to '89. And they add less than a 1/4" per side to the track width. If you're stuffing lots of tire under there, I'm just guessing that you're also running 17's or 18's, and the extra track width will be easily made up by the backspace that comes on most of those rims.

But its your choice. I run the later 11.75" Mopar disks on all my cars, they work great, and parts are readily available. Now that you can buy the 11.75" caliper brackets, its a super easy swap.