MrClean, you have an 8.8 rearend. All GT and LX 5.0's came with this rear size.
As far as what gears to get, It seems to be almost a standard practice to get 4.10's if you are running an automatic.
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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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