Would you share with me how you welded yours down? I know we should not weld on the spring itself since its heat treated/sensitive so what are my options? as grigg said,you dont weld on the spring.the spring perches sit on the springs themselves and the axle tubes sit in the spring perches.this is where the adjusting takes place. this is how i did it.center it up side to side then snug up the u- bolts.with the weiht of the truck on the springs and the cheapo angle finder on the yoke of the rear end put a floor jack under the front of the yoke and slowly raised it til i got my + 3 deg. then tightened it down.jacked up the rear of the truck,jack stands under the framerails,removed the wheels.and tacked welded all 4 corners of the spring perches.unbolted the u-bolts,flipped over the rear end and welded it up solid.once again this is my understanding of how this thing works and how i did mine.also as said if the 56 rear already has the spring perches installed andits centered and you just need to adjust the angleyou can buy shims in degreed increments that slide under the front of the spring perch and spring to raise the angle or slide under the rear to lower the angle.if the 56 rear is not centered or has the wrong size perches you will need to cut and grind the old ones off.and install new ones to get it correct.thats what i had to do with mine.as i installed a later model 12 bolt under mine. hope this helps.....................dave
