Sounds like the clutch has something loose. With the transmission in neutral and the clutch out, the input shaft is still spinning. If you put it in gear the input shaft will still spin if the clutch is let out. If it's in gear with the clutch pushed in, nothing should be spinning in the transmission until you start to move, then everything will spin.
Ergo. . .does it vibrate going down the road at 3500 rpm or is it just while sitting still reving with the clutch pushed in? If pushing in the clutch causes it, I'd say the clutch is the culprit.
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1986 four-eyed LX coupe, 358 Cleveland, Tremec TKO600/centerforce clutch, dish cut Probe forged pistons, comp cams hyd.roller cam, .579/.588@224/230, Edel.performer, 670 holley street avenger, CPR custom built long tubes, ported and polished 4bbl heads, manley valves, beehive springs, MSD peo-billet dist/MSD6AL, fluidamper, 5 lug conv. with 17x8 bullits there's more but it's still not finished yet.
Oh, and the oldest boy is turning his 89 GT into a FFR cobra this next summer.
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