i recently had my u joint snap on me and the rear driveshaft fell out. bought a different driveshaft off a parts truck and put new u joints in.

before the u joint snapped the truck would have the same vibration when driving, the previous night i was going 90 mph throughout the county in the night the notice it started the vibrating when i got close to home.
but anyway, i got the new ujoints in and parts driveshaft in but its got a decent size dent in the middle of it, im just wondering what else could be the cause of the vibration. i thought could it be the yokes but a local mechanic from a shop said they are good and just needed the ujoints and driveshaft. just want to know other causes. Its a 2006 dodge ram 1500 4x4.

 

Where do you feel the vibration? Thru the seat, or thru the steering wheel? Does it get worse with higher speeds?

 

thru the seat and some in the wheel. it doesnt get worse just stays the same.

 

Do you have to be moving to feel it?

 

Have you checked your tires? Could be a possible ply separation just starting to show up.
Usually can just run the palm of your hand over the face of the tread and feel for a bubble or loose detached rubber.
Just one possibility.

Also might try putting it on jack stands and let the rear axle spin in gear at idle .... check for a bent wheel or a loose axle bearing.
How much backlash in the pinion?

Also jack up the front wheels one at a time and check for bad bearings or something loose.

Just a couple of ideas to check, maybe something will show up.