Vibration over 70 mph

[lcducote]

OK, truck is vibrating around 70 and gets more aggressive as I speed up. Its not that bad but it is kind of annoying and getting worse. There is no correlation with the vibration and RPMs. I was wondering if anyone has had a vibration similar to this and if so what was the cause... Tires, U-Joints, rear end, drive-shaft, etc??

I have a pretty good leak from the the front of the differential so obviously the pinion seal is shot.. Could that cause a vibe to move up the drive-shaft and shake the truck?

[Zaairman]

Lets start with the basics... whens the last time you rotated and balanced your tires? How old are the ball joints?

[SickStroke6.0]

You wouldn't happen to have Nitto Terra Grapplers, would you?

[Rattlesnake18]

I have similar issues. When it first started, I had the tires balanced and rotated, which did not correct the problem. So after further investigation, I determined that my issue is cause by a bad carrier bearing.

[lcducote]

I have BF Goodrich Mud-Terrains. I balance and rotate them every oil change (3000-4000mi.)

All the U-Joints and the carrier bearings are about 3 years old with about 30,000 miles on them. I inspect them regularly and they seem to be in good shape except for the rear one is showing some wear..