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2003 Chevy silverado 1500 35" tires (do i need to re-gear)


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Hello All, 

I need some Help. So i have a 2003 Chevy silverado 5.3 (3.73 gear ratio) with a 6 inch lift kit and 35" tires.. I did noticed a difference on less power. Do i need to up grade my rear diff?? if so what gear ratio.. going forward im planning to buy an RV trailer...


Here are some pictures...


Thanks in Advanced




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