I had an 06, so 6 speed. Mine came with 4.56 on 35's. I don't think it's worth it to upgrade the gears. If you do, 4.88 isn't going to be much different than 4.56. I eventually went with 5.13 because I broke my ring gear. 5.13 was definitely better, but I wouldn't do it unless you break something. I did feel that 5.13 was perfect for 35's. Mine wasn't a DD though.
It would be more of a difference with an auto trans.