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I noticed today while traveling down the interstate that the 1800 has developed a high speed vibration. I had the seals in the rear end replaced about four months ago and the rear end was topped up with 80W at that time. The vibration has more to do with speed than RPM's because at 6000 RPM's in 1st the vibration is not notiable, but at 3000 RPM in OD it is very noticable. The vibration seems to be constant whiether the clutch is engaged or not. I tested this by engaging the clutch while traveling about sixty five mile per hour and the vibration remained constant.
Hoping that someone on the board can offer suggested items to look at....
Is it possible that a universal joint is going out?
Thanks
Oliver
66 1800S
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