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Your question is confusing. Factory cal is not a issue.
You go to the tremec ratio calculator and input your rear tire size,and rear end ratio and out comes the color of the gear you need in the TKO. Mine was a 16 T (purple, I think) get for $6.00 at any Ford dealer. In the cable hole on trannie, put the "correct " gear on the cable and insert in hole. speed is now right on.
gn
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