Odd vibration in 5th

[rangerguy302]

This little vibration started before the final drive went out. It seems to start at about 50mph and lines out at about 70-75. It also stops when the clutch is pulled and doesn't do it in any other gear. Doesn't pop out or shift hard either. Just did the 750 swap, thought it might have been in the final drive but it didn't stop. It's not bad but I want to fix it before something locks up on me on the highway. Any ideas?

[rombat]

Check your u-joint. They often behave like that when they start to fail.

[rangerguy302]

U joint seemed tight when I had it off, I'll tear into it though. Thanks for the input