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The pickups, at least the 49 had ten leafs from the factory. The bottom two are quite short compaired to the rest. The two leafs that look chopped off in the pack shown are not factory. The bottom two or three are leaves are usually the ones that are broken, so it looks like the PO did some unskilled engineering here to compensate. The one bowed out from the pack isn't doing any thing use full at all. I would dissassemble the spring packs and get rid of the two additions. If you can pair up both sides like original except the bottom two or three springs if they are missing you will find that this will perform quite well as long as you don't overload them.
If what you are trying to achieve is to raise the truck up, using the correct amount of leaves may do that and you won't need to re-arch a leaf. The springs should contain 10 leaves and be 2-inch wide.
You could also add a non-stock stiffer leaf to do the same thing.
F1 Panel only has 9 leaves in the back.
Originally Posted by Mervy49
The shackle pins remove to the out side ( grease zerk side). The easiest way to accomplish this is to remove the whole spring assembly. Shackles and all - Shave off the rivets and replace with grade 8 bolts. Assemble the springs and shackles as a unit back onto the frame.
See post #2.
Originally Posted by jrfiero
"If what you are trying to achieve is to raise the truck up, using the correct amount of leaves may do that and you won't need to re-arch a leaf. The springs should contain 10 leaves and be 2-inch wide."
I don't have any reference materials with me and I shouldn't be poking around on the web right now, but I believe the Panel Trucks had 11-leaf rear springs, different from the pickups. See my note above.
Jonas
Just for future reference, here are the spring specs: