I'm getting some sort of vibration between 80-85 mph, but only when I have my foot on the gas. I've rebalanced the wheels and it didn't solve the problem. The driveshaft was rebalanced about 6 months ago after it was flung out on the road when the rearend locked up. The u-joints have never been replaced and are now 10 years old, but the driveshaft isn't sloppy and I'm not getting any clunk sound when I put it in gear so I'm assuming they're OK. What else could be causing this vibration?

 

I've had the same thing going on in my car since I bought it.. but I always attributed it to my #1 cyl, which was taking on oil.. only thing I can think of that would cause a vibration linked directly to acceleration load would be a cyl not firing as strongly as the rest. Just an idea..

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'86 Camaro SC, black /w silver racing stripes
MSD coil, Accel 8mm wires, SplitFire plugs, Gabriel hijackers