You need to count the number of teeth on the driven gear that you are using now and find one with at least 2 less teeth. Might take 3 or 4 less, kind of a trial & error thing. I have a box of gears from over the years, try one and check it against the mile markers on the interstate. Lower numerically gears = less teeth on the driven gear. Hope I haven't thoroughly confused you.
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67 428 fastback
88 GT
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