Matching Gears for bigger tires?
Hey all, just getting ready to pull the trigger on a 2011 6.7L SD CC. Just putting together some plans on what I am going to do to it in the near future. I am looking at putting 35" tires on it and was looking at the available gear ratios. From what I have found the general consensus is that the 3.31 gears give the best fuel economy but not the best towing. Though I only plan on having about 3000lbs in the bed and 6000lbs out the back, I think the truck has more than enough power to handle the lower gear ratio. But in order to maintain the lower factory ratio overall with 35" tires, if I understand the calculations, I will need to move up to the 3.55 gear ratio. This will give me a ratio of about 3.35 at the rear. Am I looking at this correctly?
Also I would assume that I can get the dealer to make an adjustment to the computer for the 35" tires which will then reflect the 3.35 final ratio when it comes to the speedo readout etc...? Thanks.