I have a 2005 Avalanche 2wd, limited slip rearend I also have a 160 thermostat a Jesse Bubb tune, homemade cold air intake and throttle body bypass. The tires are 285/70/17 BFGs. Because of the weight of the Avalanche I really don't have a spin issue and the big tires don't help that either but it looks so much better than the factory size tires. It weighs in at 5950 with me in it.