PICS!
Also, *measure* the fender height for *both* sides. And, what is the *exact* size and *model* of tire. Pics will identify the rims.
There are *many* reasons why the tires could be rubbing.
You need the above info AND pics before you get any info that is worth anything.
Mach1 or Bullitt springs are the
CORRECT way to lower the car (~1/2" -> 3/4") and get better handling (spring rate is ~50% stiffer). Pretty much
any other spring is for
looks and
not handling.
http://www.veryuseful.com/mustang/tech/misc/Mustang1986_with_Mach1_springs/
Note: I have an AOD. If I had a 5-speed, I would
not have used the Steeda spacers. For a 5sp with AC, the Mach1 springs and
without the Steeda spacer would result in a fender height of a little lower. I run wider 245's (720's) and I have 94/95 spindles and D178 rims up front - *all* of that is important in squeezing it in an Fox. Still, I, like many others, are into the POS factory tolerances of Foxes in having my combo fit. So, the same exact combo may not fit on another '86. Or, it may have even more room than I have now.