My 94 xtra cab has a bad vibration at about 55 mph on the highway. I would describe it as the same as the feeling of having an unbalanced tire without the input to the steering wheel. Now the obvious here would be a u-joint (long wb has split d-shaft) but they feel tight to the hands. Now, what doesn't feel tight is the third member. It has tons of play, and seems to occasionally make erratic noises when you let the clutch out in certain situations.

Could a worn out/ loose gear or pinion cause vibration like this?

Also, the transfer case side feels like it has some play but I doubt that would cause it.

Anyone have any input?

 

i have the exact same thing, pinion bearing is bad in mine.

 

That would be the ideal thing because I have a spare 4.10 sitting in the back yard....

 

 

update??????

 

I feel like an idiot, started taking the driveshaft off and the u-joint in the far back was completely shot...

I don't know what the heck i was smokin the first time I checked it

 

must have been some good stuff haha.
reading the first post I was thinking of something in the front suspension

 

lol, at least it was cheap