iX Strange noise

[park123xyz]

Just recently my 88' iX has been making a strange noise. at the top of 3rd gear and at highway speeds in 4th and 5th it makes a really fast vibrating/rattling noise that i think is related to the driveline somewhere because it only occurs when im on the throttle (past half throttle to be more specific). I cant go any faster than 75 on the highway before it vibrates / rattles really fast. 1st gear and 2nd are both fine. Any ideas???


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[packratbimmer]

My car was doing something like that, though it was not really a rattle. Check your rear shaft U-joint and your rear subframe bushings.

My right bushing was out and it caused my U-joint to fail.

[The Dark Side of Will]

Driveshaft U-joint and/or either guibo could do that.