Definitely check your u joints and make sure that your driveshaft is in balance. I was having the same problem on the freeway bc my U joints were trashed and the bearings were shot. I bought the fms driveshaft and havent had a problem since.
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95GT B303 cam, 1.7 rockers, 65mm TB, 73mm MAF, milled heads, 355's K&N, off road pipes, pulleys, msd coil, 9mm wires, Tremec 3550, Pro5.0 shifter,10.5 Motorsport clutch, FMS aluminum driveshaft, weld in subframe connectors
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