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does this occur only in high gear, or when you reach max rpm in each gear?
some vibrations with tires/wheels don't show up until high speed (revolutions). again, is this at one particular speed, or at a particular rpm in each gear?
a bent wheel will show up immediately (vibration), and continue to high speed, so this should not be the cause.
Torque tube vibrations (bad bearings, bent shaft, and the like) will show up immediately as well, so probably not the cause. Same thing for axle shafts.
CV joints will make noise when going bad, lots more noise at higher speed. could this be what you're dealing with? (it's usually not just a high speed problem)
clutch/flywheel/crank balance, would also show up immediately, but would be more noticeable when the engine is under load.
engine misfire is another item, but ask yourself why it only does it at high speed (rpm's)? If this is the cause, it is probably not spark related, but fuel related. The fuel pump(s) may not be putting enough fuel volume to the engine for it to keep up with the rpm/load requirement. Another fuel issue could be filter, tank, pick up or line restrictions. G-forces can also come into play with this.
I have run many drag race cars that exhibited no vibrations or engine stumbles while revving/sitting still, but when you put a load on it (running it down the track) the fuel starvation becomes apparent.
these are just suggestions and are in no way a complete list of things to go through, but you can start with them.
good luck---
--Russ
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