99 Yukon 4x4

[Tiberiusx]

Hi folks I recently came into possession of a 99yukon slt with 263000km 5.7 ltr
It starts and runs well around town at speeds around 30-40 mph but on the highway at 60mph plus I hear a rumble in the inside of the vehicle it appears that it's from the drive train? When I let up on gas coasting the sound is gone.
There are no codes being displayed on my scan tool
I'm thinking of worn u joints? Drive shafts ?
Has anyone had something similar ? It's like I'm driving on rumble strips.
There are afew leaks drips seepage on some parts - front diff,trans case but fluids levels are good.. Thanks for the help!

 

[noJeepshere]

From what you describe it sounds like your u-joints are toast.

 

[Tiberiusx]

Thanks, I was hoping that would be the issue... Will be looking at it shortly..

 

[98 2-DOOR]

Agreed, U-Joints is more than likely the problem. I had that exact issue and changing them solved the problem.

 

[Tiberiusx]

Replaced all u joints on drivetrain man what a difference, thanks