Hi all, I am new here and have a few questions. I have a 2000 GMC Sierra with a 5.3l 2WD. I lifted it 7" and have 33" tires on it. The thing is a DOG. I am looking to purchase a 21'-24' toy hauler which weigh around 5-7K lbs. Is there anything I can do to the tranny and rear end to make it tow better and give it a little more pep? Truck has 190K on the original motor and trans, stock rear end. Any help would be appreciated. Thanks!