4.56 gears with 305's

[mario28]

Looking to get some advice on running 305/65/R18 (33.5")tires with either 4.10 or 4.56 gears. Custom Diablew tune coming soon after gear choice so I want to factor that in. Just don't know if 4.56 will be "too much" since it's not a 35" tire. Any advice is appreciated!

 

2011 Sierra 1500 5.3L 6 speed

[jonny72888]

Im swapping from 373 to 456 as soon as I get all the parts. (back ordered gear) I have a 13 2500 6.0
I do alot of towing and plowing so im looking for some low end power. I have stock size 32in tires.

Do you plan on doing the swap yourself?

[mario28]

Went with Yukon 4.11 gears instead. Gears are being installed as we speak. Didn't attempt to change the gears myself, it's a pretty technical job, would rather have someone with years of experience do it.

[MB2008LTZ]

4.11's will be fine with that size tire, just don't expect highway cruising to be the best. 4.56's would have been awesome if you have a bunch of horsepower to back it up, but you did not specify engine specs in your original post. I have a 2008 LTZ 5.3 extended cab with 3.73 gears (factory) and I run 275/60/20 tires with a 5.3 supercharged and blackbear tuned set up and I love it for highway cruising but wish I had 4.11's for off the line fun. My 2 cents....good luck!