Ive been having a vibration/loud noise coming from somewhere underneath my truck for the last 2 weeks. It is hard to pin point exactly where it is coming from.

Once I hit 30 mph, I get a loud annoying growling/rumbling nosie from underneath truck somewhere and when I let off the gas pedal, it gets louder.

Last weekend, we pulled the front hubs off and the hubs/wheel bearings/brakes rotors looked good.

Today, I pulled the rear drums off and on the drivers side, the adjusting spring was broken and fell on ground. It was bent the same contour as the brake show so I am guessingit brokw and was in between the show and drum.

We thought that may have been the problem.

I went to store and bought new one and installed it but problem still there.

Any more ideas?

Again, loud rubbing noise over 30mph and on decelerating. Very loud.

 

shift it into neutral while you're decelerating and see if it's still happening...

 

check the u-joint, sounds like what mine did before it fell out on the highway doing 70.

 

when u shift whiling coasting to a stop, the sound is scary loud.

i already got underneath truck and looked at u-joints, they looked ok, but maybe i am not looking at them right, how do you check them?

while the truck is in neutral, the driveshaft spins about 3/8" - 1/2"

 

To check the u-joints remove the driveshaft from the truck and grab the yoke on each end. Make sure they move freely each direction. If there is any resistance or they don't move smoothly you probably need new ones. The movement you have in the driveshaft while in neutral seems fine. Check you u-joints first, but you may need to start looking at your differential.