well the t-56 in my 94', which i believe is the problem, has a vibration to it. well to be more clear while i am on the freeway doing about 70 or so when i let off the gas is vibrates and then stops after a couple secs. but when i let off the gas and immediately press the clutch no vibes. i guessing here is the tranny. does anyone what could be the problem? could it be that the input shaft hass excessive play? if so can it be repaired or am i screwed? well thanks for any info guys.

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86',88',89' IROC-Z, 350 TPI, 700-R4

94' Formula, LT1, 6spd