Ok, I wasn't sure what you were trying to accomplish. I was thinking that you wanted it to "crawl" better and was thinking that you might want to go with a lower gear in the transfer case for the low 4x4 setting.
It seems like the 4.56 with 38s is right at the same as 4.10 with 35s. I think you would get diminishing returns if you could put 4.88s in though, it seems you would being hitting high RPMS on your top end. With the SC on-board and for flat out dragging and running the 38s it seems like the 4.56 should be enough.
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