It sounds like you have either 2:73's or 3:08's to me. In my '88GT the tach is at 2000 at 80mph and I have 2:73's. There is a tag on the driver's side door, look at where it says "gear" and there is a letter there.
Mine says "M" which means a 2:73 gear. I forget what the other letters stand for but there are people on here that would know.
Another way to tell for sure is to mark a spot on the drive shaft and a spot on a tire and turn the tire and count how many times the shaft turns with one complete turn of the tire.
Hope this helps, but it doesn't sound like you have anything more than a 3:08 gear
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'82 GT 351W C-4,BBK headers,Carter 625 carb,Comp.Cam,Flowmaster exhaust.
1988 GT...T-5,bone stock
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