If you want to get a lot of wheel travel flip the shackle like chevy's have them. Prerunners do it all the time for long travel rear ends. You should only have 2 or 3 leafs if you want them to flex. I'll be picking some up in the morning.
got them. still debating if i wanna re-arch them and flip the shackle. i really like my lift shackles, and would much rather keep them and just replace bushings and bolt the leafs in minus the 2" block.
im grinding the rivets off the front mount and moving it forward, nothing is changing with the rear, nor needs to. a custom brace will be made to support the new mounting locations from a sheering effect of the frame.
Im having my friend who has 64's help me out with the install, so i'll have a set of experienced eyes looking everything over.