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Message: [QUOTE="JHTX, post: 1522535, member: 28711"] Calculation is pretty simple it’s just a ratio of tire size to gear. In my case it was 32/3.31 = 37/X. Your left with x = (37 x 3.31)/32, which would give you 3.8 new gear ratio. The nearest gear would be 3.73, but you could go with 4.1 if you were hauling or wanted more power in your lower end. I also checked the RPM charts and this puts me about back to stock curve. If you want a factory option the only thing available is a 3.73. If you got aftermarket Nitro or Yukon you can get the 4.1, but you will need a slim gear ring for the front Dana, so you don’t have to replace the carrier. Note I had 18” wheels and 3.31 gearing. If you had 20” & 3.55 it still comes out to x = (37 x 3.55)/34 so 3.86. I think personally it comes down to preference on how much power you want in the lower end to get the tires moving and how much towing you do. I went with 3.73, as I float between 37s and 35s as I have a Carli 2.5” lift, and did now want to be over geared if I go back to 35s. I have never noticed my truck struggling with this setup, but I sometimes wonder what a 4.1 would drive like. I think larger gears is a by product of the older 4 speed transmissions, with the six speeds you may not need as high gearing in differentials as the transmission gears are closer. Hope this helps. Sent from my iPhone using Tapatalk [/QUOTE]

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