if you're uying a fresh one or find one used, the aftermarket versions of the t56 have a 2.97 first and .82/62 fifth and sixth gear ratios (if i remember the exact numbers)
i run one behind a small block in an s10 (for sale!!) with 3.73's; it's great; pulls 6th gear from 40mph clean.
ratios are well spaced for fun, 5th gear fine all day from 30 up.
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