Dan, my rear is about 6" narrower than what I need to match the front, and bolt battern is different also.

I can install a Crown Vic rear to match my front suspension that has 3.27 gears. Has discs, but will be require removing spring and trailing arm brackets, but that's an easy fix for me.

80-83 F100's come with correct bolt pattern and width, available with 3.50, and I believe 4.11's, but that may be a little harder to find. Would have to get a kit to add the rear discs that I want.

Using my tire diameter(26.75), I come up with

3.27-2604 rpm @ 60mph

3.50-2778 rpm @ 60mph

I'm leaning towards the 3.27 rear. Have to go search the junk yards to see what I can find.

Thanks for all the replies. Nice to be on a site where you can get help instead of criticism.

Bill