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2013 GMC Sierra gear swap

Skunkworks84

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Skunkworks84 New Member

Skunkworks84

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I have a 13 Sierra half ton with a 4 inch lift and 33x12.5x20s. 5.3l with k&n and exhaust. Truck has 3.42 stock gears. The tires are 10 ply. They weigh roughly twice what the stock factory tires weighed. My question. I want to get the truck as close to factory final gear as I can. With compensation for added rotating mass (tires). The truck has the cylinder drop feature. But with the taller tires and added weight it never drops unless the cruise is set at 70 and you are going down hill. 3.73 would return the gear to stock on paper. But the weight is affecting it. Would 3.96 be better. Would 4.11 be too much. And do I have to get the computer re tuned afterwards? Shift points and all that. This is my daily so I would like to get the mileage back as well as add the pick up it bad when stock. I'll take all the ideas you got. Thanks!

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