Ok guys. Have a bit of a problem. My truck shakes like a belly dancer jigalow. My tires are balanced fine. All my rear drive U joints are new. Its weird. If I accelerate I can feel it shaking. It shakes really bad from 70 to 75 straightens back out a bit at 80 but still shakes. It makes no sense. I've tried speeding up to 85 then put it in neutral and sure enough as it slows from 75 to 70 its shakes so bad my dog has to stop to empty his bowels. Its a nice truck ran great up till about a week ago. Any ideas?

 

Several things..

Are the tires speed rated for that MPH? IF a tire is not seed rated it will wobble. Broken or seperated internal belts in the tire will cause the same thing.

4 wheel alignment? 2 Wheel alignment? Ball Joints, Tire Rods?

My tires are new, but the speed rating is about 70 MPH, over that they will shutter until I reach 80ish....

Just my uneducated opinion... I am sure a more reliable person can better answer.. But this is my speculation.

 

Thanks for the help. Got it fixed. It was one of the Ujoints. The guy that put em in didn't put one in far enough for the snap ring to snap in place. I put a clamp on her to push it in place. She drives great now. Can't believe the it all came from a U joint just being the slightest bit out of place.