Originally Posted by azmidget91
Installing drop shackles is not the same as putting a load on the truck.... Drop shackles on these trucks will effect the u joint angles much more than the older trucks that have shorter leaf springs.
Definitely changes the pinion angle more than the stock springs with a load would ever allow. Heck, the top of the shackle almost touches the bottom of the bed.
Just remember to make sure the pinion shims are mounted fat side to the rear. The other way around definitely didn't work.