im trying to replace my driver hub assembly on my 2001 1500. I took everything apart, but when I put the new hub up against the bad one(still on truck) the new one looks a good bit bigger(deeper). My original hub looks noticeably smaller. She didnt give me the 4 wheel abs hub because it doesnt have the plug on it and I saw in her computer that the 4x4 hub was even bigger, so what gives. What hub could I possibly have?