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The bottom spring perch of the 5100 is higher than stock and provides 1/2" of preload lift, so you might want to add a 1" block, but that will give you 1/2" of rake.
What I would do, (on an '06 2wd), is sell or trade the 2.5" leveling kit for a 2", then with 5100's on the lower setting you should have about the same stance as you do now, and probably not have the bucket contact. That way you wouldn't need an aftermarket UCA, or a rear block. The 5100 rears are supposed to ride better than the HD rears, so that's a plus too.
Or get a PRG 1.5" level kit and set the 5100's to the middle perch for about 1/2" more lift than now and no bucket contact, but a little firmer ride, and a 1" rear block, and the PRG drop shackle set on -1/2", (that will keep you from having the stock shackle from breaking the spot welds and letting the leaf pack shoot up through the bed). You can also set them on 0" drop, or run a weld bead on the OEM if you are staying at 0 drop.
Btw, you can grind U shapes into the coil bucket lip, spray paint, look for new nicks after a couple of speed bumps, repeat. I used a Dremel tool with a grinding stone on mine, but even the sanding barrels will work for smaller jobs.
What I would do, (on an '06 2wd), is sell or trade the 2.5" leveling kit for a 2", then with 5100's on the lower setting you should have about the same stance as you do now, and probably not have the bucket contact. That way you wouldn't need an aftermarket UCA, or a rear block. The 5100 rears are supposed to ride better than the HD rears, so that's a plus too.
Or get a PRG 1.5" level kit and set the 5100's to the middle perch for about 1/2" more lift than now and no bucket contact, but a little firmer ride, and a 1" rear block, and the PRG drop shackle set on -1/2", (that will keep you from having the stock shackle from breaking the spot welds and letting the leaf pack shoot up through the bed). You can also set them on 0" drop, or run a weld bead on the OEM if you are staying at 0 drop.
Btw, you can grind U shapes into the coil bucket lip, spray paint, look for new nicks after a couple of speed bumps, repeat. I used a Dremel tool with a grinding stone on mine, but even the sanding barrels will work for smaller jobs.