For those following the post. The 315 tire, 10.5" wheel mod is finished (FFR MKI). I cut down the rear axle tubes 11/2" on the passenger side and 1" on the drivers side. (my rear axle was always off 1/2 inch, a very common FFR MKI issue) each side and used new Moser axles made to my specs. The axle cut is totally dictated by wheel backspacing and offset. The 2X3 steel tube that is under the trunk was cut flush to the trunk aluminum. I cut out the "stock" mustang shock tubes and installed Viking dual adjustable coil-overs behind the axle. Eliminated the quad shocks, moved calipers from 10 o'clock position to 2 o'clock, rerouted brake lines, E-cables etc...… I have about 1/8th" tire clearance inboard and outboard. After a few short test runs, no rubbing or strange sounds. I am waiting for warm weather to get a good heat cycle on the tires before I really give it a good test.
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