that continual bouncing is two problems.
first-your springs need more help-either new ones or helper springs or airbags
in the rear.
second your bouncing problem is due to your rear shocks(if you have any) being
totally shot.
install shocks on the rear-contact me for part number if non-stock
application(I have a monroe book by length compressed/extended)
bumps after that should just go down/up 1 time only.
those bed "shims" are not due to load capacity-they are just simple
replacements for what most likely used to be wood spacers to get the bed at the
right hieght to clear the 'hump' over your rear wheels and keep bed level
w/frame.
Mark
--- In old-chevy-truck@yahoogroups.com, "fahrbach51" wrote:
>
> Sorry, I should have clarified this. I believe my leaf springs are shot from
> years of putting on staked side-boards and loading up the bed with wheat to
> haul to town. I have even noticed the bed is "shimmed" up by inserting some
> cast metal pieces under the bed wood frames, certainly to help offset the
> effect of the heavy load. Now, any dip in the road continues to lazily
> bounce the truck for three or four more bounces. I need to get back closer
> to the stiffness it was from the factory. Thanks for the replies.
>
> Fahrbach's '51 3600
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