In the suv you won't have the 10.5" Full floating axle. You have the 9.5" semi floating axle. Not as strong as the full floater, but better than the 8.6" diff in the 1500's. The rear differential gearing in the suv is the only difference in the tow ratings of the suv. The 2500hd trucks are a different platform and have bigger frames than the suv's.
calsdad wrote:
With the Chevy 6.0L engine at least the HP and torque numbers go up some as the RPM's go up. Reading thru some other forums I've seen numerous people say they see the rpm go up 200-300 on the tach at highway speeds going from a 3.73 to a 4.10 ratio.
I haven't sat down and mapped the torque and HP curve to the RPM rise though to see what that gain is.
The reason why I'm asking this is that I just picked up a 2010 GMC Yukon XL 2500. Which is basically a 2500HD with an SUV body. It has the same 6.0L engine and the 6L90 transmission as the 2500HD pickup. I believe the rear axle is the same also.
My line of reasoning is that if the factory has a formula (component list) to raise the tow rating to 13k, I should figure out what the formula is and use it to beef up this truck.
