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so i see some guys buy lowering shackles and some guys flip the axle,are these both correct or is one way better than the other?

secondly,i assume this swap works in reverse?i have a van i want to raise for tire clearance and this month i will be gettin a /6 truck i want lower so would this be a feasable crossover weekend swap in a driveway with basic tools and a pistol drill?

A good elder is needed to weld on new spring perched and also new U-bolts and car spring plates for axle flip to lower. Not failure with vans. If the leaf is under the axle that yes you can lift it by putting the leaf on top of the axle. New perched will need welded on and you actually might be able to just swap spring plates between van and truck along as the van is indeed axle over spring as All fullsize trucks 72-93 are axle under spring. Also need to correct opinion angle