It's the U joints in your driveshaft. The shifter shakes horribly and when you hit a really high RPM in 4th you hear what sounds like a helicopter landing on your car. It makes a WHOOP WHOOP WHOOP kinda deep vibrational sound.
I had the same problem, I got the FMS aluminum driveshaft, it comes with beefy 1330 U joints. Its worth the 160 bucks. It will make your everyday drive SOOO much better.
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95GT B303 cam, 1.7 rockers, 65mm TB, milled heads, 355's K&N, BBK Longtubes, Flowmaster cat back, 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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