Any problems with 2500 hd rear axle?

3.73 gear ratio should be just fine for pulling this weight, 4.10 or 4.11 I think you mean, will decrease your gas mileage dramatically. Once you get the rear end situated, I'd look into a good rear end grease to put in, I am a fan of Amsoil Products, very highly rated. Otherwise I think the rear end in your truck is a lemon.

Thanks Rowefast. I already run Amsoil in the 2012. Bad from the word go and I had upgraded to Amsoil right after the first repair. Thinking about upgrade to 4.10 as I already have an Avalanche with that rear. Not concerned about fuel when pulling. Its bad no mater the rear.

Sounds like a plan, good luck to ya...