I am driving a 2011 Tahoe with a 5.3 litre engine. I am not sure of the rear end. I have the six speed manual transmission. I am pulling a Keystone travel trailer. 4800 lbs empty. I am running in four...
2500 RPM at 65mph sounds too good to be true. That is below the 5.3s power curve and just loafing. Those motors are built to make power at a much higher rpm. On hills, let it downshift and rev up to maintain a decent speed.