dood....peep out the chev spring swap faq on pirate4x4.

I'm 99% sure(off the top of my head)you need to move the front hangars forward *about* 9 inches. you also must move your shackle hangars back *about* 4 inches OR use a double shackle OR really long single shackle.

do the math on the springs, yours will be 48" long and the chevies are actually 64"  long (everyone one calls them 63's though")   64-48=16  so you gotta make up the difference somewhere.