What would cause my disco to vigorously vibrate while driving? It only does it between 25 and 35 mph.

 

tire balance

 

I had my tires balanced not to long ago. I'm think it might be bad u joints in my drive lines but not sure?

 

bad u joints

 

Can you elaborate on the vibrating any? Does it change with speed? Does your steering wheel shake?

 

i've found that 90% of the time if the vibe only happens in between certain speeds it is tire balance. but yea, elaborate on the vibe. wheel shake? whole truck shake? low frequency hum?

 

The whole vehicle shakes extreamly bad but only between 25 and 35 MPH, and smooths out after that. It kinda seems like my drive lines are wobbleing but they are both tight thats why I think it might be bad u joints.

 

so your driveshaft joints are tight. you don't have axle shaft u joints, but you could have bad/loose wheel bearings. swap the tires front to back and see if it helps. is the truck lifted? you have a 95 so you still have the rear rotoflex thing... hows that look? with a lift that will wear or show wear faster than normal.

 

My vehicle is lifted 2 inches, I've checked my wheel bearings and they seem just fine. I don't know what rotoflex thing your talking about? I can try swapping my tires.

 

its the thing you have on your rear driveshaft instead of a ujoint at the axle yoke.