Mechanics

GMC SIERRA TIRE PROBLEM

2011 GMC Sierra • 13,000 miles

Need your advice. Have a 4"inch lifted truck with stock 3.42 gears and installed 33.2 inch tall tire (old tires were 31.6 inches tall) Have done aftermarket parts on my truck like flash pak super chip, airaid intake and body spacer and magna flow exhaust. Truck runs good but amechanic told me I neede to change my gears so my engine would not work harder then what is working right now. What do you think my mileage right now is good for a lifted truck.
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Lowes
November 17, 2012.



You hardly changed the rotations with the tire size. I dont think it is hurting the motor at all

the other option is 3.73 but the motor will run faster at higher speeds lowering your mileage

Roy

ASEMaster6371
Nov 17, 2012.