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New tires, would like to regear to compensate

4998 Views 18 Replies 6 Participants Last post by  Rockstarrchevy81
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.
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This chart may help guide you as well.
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
When I was shopping around for my 4:56 gears, I was told that I have the smallest housing; however, no one mentioned that there could be a problem with them fitting, but I did get a few recommendations to get rid of my G-80 since I do a ton of off-roading and the smaller rear-ends like I had tend to blow up pretty easy when 4 wheeling.

With my 4:56 gears, my 4" lift, and my 34.5" tires, I am still getting about 14mgh city and 18mpg hwy....but I also have it custom tuned and some other mods that help with getting better mileage. I leaned toward the side with a little more power and less mileage, as this is not my everyday driver and I spend a lot of time climbing hills. I'd go with the 4:11s with your set up...I think you'll be happy with the extra power and won't really notice the mileage difference (too much!:glasses:) .
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