Join Date: Nov 1999
Location: Where the Navy sends me...
As 92MN said, first things first, fix your tire mismatch. I couldn't agree more with his assessment - the larger rear tires + the fact that your front tires are horrible = more tendency to understeer.
You can go to a softer front sway bar. The stock 4cyl swaybar is a good upgrade, and it's significantly lighter than the stock GT bar to boot. I got one free off a soon-to-be-junked 4cyl Fox convertible, and I'm sure you can find one at a junkyard somewhere.
Looking longer term, do you have any plans to do the front suspension (K-member and A-arms)? The TA/PHB rear adds enough rear grip that if you don't significantly change the front suspension too, you're pretty much always going to be battling understeer.
'89 GT convertible, N/A 357W, MM front susp w/425# coil-overs and Koni D/As, MM TA/PB rear setup (Koni Yellows, 390-430# springs), Stoptech 332mm / 12" Baers, MM 6 point rollbar, Maier 1.5" flared fenders & quarters, 18x9.5" front/18x10.5" rear Enkei RPF-1s (street), 18x10" CCW C-10s (track), etc...