This is just a fleeting thought at this point but I'm curious what is even available. In searching the forum all I can find is info on 1500 trucks. I have a 2500 gas with the 3.73s and I know the 4.10s were an option. Are there 4.30s and/or 4.56s (or something else?) available for my truck? It's a 4X4 so I'll need both front and rear.