Re: transmission issue....
I had a similar problem with my 95 gt/auto. If you got on it hard enough to start breaking the tires loose, the 1-2 shift accumulator spring was broken and would shift sideways just a little and get stuck causing it to not shift into 2nd until the rpm's got high. Actually a simple fix. Just have to drop the pan and you can see the accumulator. Take out a snap ring and give it a tap to straighten in out, so it will slide out. Then you can replace the spring. Ford part only, they should still be able to get it for you. Was right around $50 for the whole thing. Piston,springs, etc. Maybe its the same thing?? Would be worth a shot if your able to check it yourself.
1986 GT T-Top. Driving Project