Changing Gears on 01 Yukon 2500 4x4

[sxmax]

How hard and how expensive would this be to do? I currently have an 8.1ltr with 4.10s and it cranks a few too many rpm for me at highway speeds and thus the gas mileage takes a hit. I mainly use this for hauling the family and occasionally towing. It was a too good of deal to pass up at the time. Any other suggestions other than slowing down? I have tossed around the idea of larger tires to help out, but I did not know how much that will help.

 

Thanks!

[Charlie in TX]

Now I'm no expert but I will do some math for ya. First, my understanding is it costs about $500 per axel to regear. Going from 4.10 to 3.73 is about a 10% reduction. So going up 10% in tire size should do the same. If your burb came with 265s put some 295s on it and see.

[sxmax]

It only has little 245's on it and to go up 10% I would need to start changing and trimming to get that size of tire to fit.. I think? 245's to 285's? Is that possible without selling the farm??