I got a 69' 1/2 ton vibrating,gradually getting worse. It's a new build I've went all out on. New tie-rods,wheel bearings,ball joints,u-joints,driveshaft,transmission, torque converter,transmission mount,motor with less than 25k miles. Motor mounts have maybe 60k miles on them and looked fine when I put this motor in. I had a bent drive shaft that caused same type of vibration before I had another one made,the tranny&mount along with driveshaft were all new and put in together. After about a 150 miles my truck is vibrating again.Anything above 40 mph it's pretty bad. What am I missing?