My burban has a 350/400turbohydromatic, NP 203, and 3.73 gears (open diffs I believe, and I plan on leaving them that way). Will 36x12.50 tsl's be too much tire for this gear setup. I don't plan on any crawling, all just medium speed muddin down old logging roads, and an occasional drive into town. I have known some people that ran 40's with stock gears, are they retarded, or can you get away with that much increase without gears? I've never ridden in a truck with large tires and stock gears, will it feel sick and lugged down? Any input on what I should do would be greatly appreciated.