Doing donuts in my new daily 04 GMC Sierra 1500 VHO I toasted the factory G80, boredom has really set in without having a fast toy to play in...

Already decided I on going with the Detroit Truetrac but need help deciding on the gearing. The factory 3.73's work just fine but since I am already going to be having the differential replaced I want to replace the gears too, along with all the bearings. Just the way I do things... once!

This truck will be towing a 5500 lb trailer hauling my drag truck to the track weekly during race season.

So my question is 3.73, 3.90, or 4.10 gears. I am looking for the best balance of benefiting my towing capability, MPG while towing, and MPG while not towing.

Personally leaning to 3.90's but wanted some outside opinions. Thanks!

Jay