Originally Posted by twinboat
Spring U bolts need to be tightened to specs.
If not tight, the clamping force may not be enough to keep the axle from moving against the spring.
Remember Ubolts keep the axle/tires/brakes under the springs which are connected to the chassis.
As the axle moves it starts hitting against the spring center bolt. Once that wears or snaps, the axle shifts, causing alignment and other problems.
Thanks, my wrench is big enough, I just need to put my foot into it! And I get what you are saying, a lot of forces in play while driving so I will get it torqued down to 250 ft/lbs.