Re: gears vs tire size
Believe it or not I run Yukon 5.38's with P235 75 R15 tires. The tires are about a 1/2" smaller than a 30 inch tire. At 65 mph(checked with my GPS) I'm running about 4600 rpm. and about 4000 rpm at 55 mph. Even though it is geared a little low for the highway I don't mind. It is much better driving than the stock gears were with this tire. And the reduction, which is about 40%, works great for those muddy trails we get here in the midwest. Sometimes I think the super low transfer case gears are sometimes too low for the muddy stuff, but are great for the rocks.