I think 4x4 parts has 4600s for use with lift, I'm almost positive I saw them somewhere. The thing that gets me tho is the 5100s I ordered are supposed to work with a 3" lift, but they were almost the exact length compressed and uncompressed as the cheap a$$ Excel-G shocks I have. I figured there would be some additional length there, and even hassled their customer service about whether I got the correct thing, but as the old man says, "I guess that's what I get for doin my own thinkin!"I was gonna try the 4600s but I couldn't find them for the lift. So I can't tell you what the difference between the two would be. If I could drop the tires down to about 25psi it would probably help but wouldn't last long I'm sure.