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New tires, would like to regear to compensate

4994 Views 18 Replies 6 Participants Last post by  Rockstarrchevy81, 
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I have a 2010 silverado 1500 with the 5.3L and the 6 speed, and the 3.08 gear. I have recently added a lift and tires and obviously truck no longer has the grunt off the line like it did. I know I need to change gear to fix this small issue, I would like to know which gears would be ideal for the new tires and still keep my mileage from falling thru the floor. I had the 265/65/18 tires stock, and now I am running a 305/65R18 almost exactly 2 inches taller, I know I will not get it exactly like it was but I was considering a going to 3.73's. Will they fir with my current carrier in my front diff? The rear diff should be fine. Any info would be greatly appreciated.
Thanks
Blu
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SS, yes the truck is 4wd and since I was talking about concerns for the front diff should have been a give away ;). And you think a 3.23 gear is right? Or did you mean 3.73?
Thank you fleetwood, the chart helps. But 1 concern, question I have is will I need to get a new carrier for the front diff will it all fit in the case?
Since I have the 6 speed and reading the other posts about this I'm really considering going to the 4.11's and calling it a day
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New tires are 33.6 tall stock were 31.6 so a 2 inch increase in height
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I do have several other upgrades done to the truck, like a corsa cat back exhaust, banks ram air intake and an edge power programmer. I appreciate the help, but I have 1 more question what size axles are in these trucks now a days both the front and rear so I can start looking at prices. I was considering canning the G80 rear in favor of a detroit e locker
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