My friend has 33" tires on his Blazer and need to know what is the best all around gear for this setup. He is in the process of redoing the diff's and it has 3.08's in it now. He is moving to Alaska this summer so he has like a 4 or 5 thousand mile trip ahead of him. he won't be doing alot of highway driving after this move but four wheelin alot more. He has a turbo 350 in it. I am sure he doesn't want to go to extremes but the 3.08 just make it a real dog. What would be optimum 3.73? 4.11?