Had the same problem...
Had the exact same problem about three weeks ago. Minor vibrations became very apparent under stress and high speed. I would look at my Pro 5.0 shifter knob in disbelief. Anyway, I dropped my driveshaft and found my U-Joints completely shot. One bearing had cracked. Fortunately, no harm done. Got the "good" ones from Napa with the grease fitting on 'em. Hope this helps...good luck.
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1988 GT Convertible
331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta...
One week with new motor, two speeding tickets...joy
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