I have a significant vibration with my GT6 which occurs only at speed, in 4th
gear starting about 300-400 before redline (approx 6600 RPM). In any other
gear to redline there is no problem, so it is related only to speed. I had the
driveshaft universal joints replaced and balanced with no change in the
vibration. The tires are brand new and balanced as well, although I did have a
bit of shaking of the car, so I will have them re balanced again. But I need
to know what I should look at next to find the solution to the problem. The
diff? Rear axles? And what items specifically? I have to back off a bit near
the end of the straight at Summit Point due to this problem, which sucks. A
longer straight at another track would be even worse! Any help would be
appreciated! Thanks- Jay De Pol
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