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grab a big c-clamp, clamp the springs together so they don't fall apart.
vice grips on the "pin" side and wrench on the other. if its really rusted, might have to cut it off, or it'll break once you start torquing it.
new grade 8 bolt, proper length, grind down the head so it fits and you've got a new center pin.
You can buy new pins that are a little extra long and you cut off what you don't need . I got mine at NAPA , our local parts store . Take one of the old ones in to get the right size .Yeah , use the C-clamps and it's a pretty easy job .____JIM
Are you doing a front or rear add-a leaf, repair work or adding leafs for a lift?
Don't forget the spring pack wrap clamp. And after you drive it for a bit (25 to 50 miles) do a re-torque on your u bolts, things tend to settle after a few miles and loosen up.
Im adding helper springs to the front packs so I can put weights on the front for pulls. And ironically the spring although only 5/8" thick gave me what would appear to be around a 2" lift. Not gonna complain about that!
it'll settle a little bit. if you want your leaves to work better, disassemble the whole pack, clean all the rust and grime out of there and slap a fresh coat of glossy paint on there. works wonders for softening them up too, since internal sliding friction plays a huge part in how a leaf spring rides.
Actually for me the stiffer the springs the better. I plan to put around a thousand pounds of weight on the front weight bar so we need a nice stout front end