I've come to the conclusion that simply by doing the bastard pack it greatly shortened the length of the spring pack. I removed the shackle and cycled the axle up and down and the axle only moved back about 1/4-1/2 an inch at best. I am thinking about removing some of the leaves in the pack to lessen the arch and keep the shackle because that works nicely with the relocation brackets. Any idea how the length of the whole pack is effected by doing a s10 bastard pack?