This U bolt clamping of the leaf spring pak
is the worst bandaide idea I've read of.
possibly even unsafe
mfg'r designed leaf spring u bracket clamps are not U bolt clamps...
and do not sandwich (clamp) individual leafs together.
usually the lower U bracket is riveted to a lower leaf in the pack
and the upper closure of that is a roller (bolt w/roller sleeve)
individual leafs that are clamped cannot flex properly during compression.
this can cause a bouncier ride at the rear.
because the individual leafs in the pak are binding.
when individual leafs in a pack are compressed...
not only do they bend (flex)...
but they also shift outward of the center of the leaf pack.
installing U bolt clamps to limit leaf spring movement...
isn't a proper correction for axle wrap.
I had Deaver custom build me some 9lf paks...
with consideration of the common axle wrap issue.
What was engineered, eliminated axle wrap to nearly nonexistent.
and with minimal compromising of the leaf paks full flexibility.
Generally most axle wrap occurs at the forward end of the leaf pak.
There, the leaf pak will twist and arch when under load.
Stiffening up the forward side of the leaf pak will help
in combating axle wrap.
Too stiff tho' and it could degrade compression/droop travel some.