cheaperrooter

So my new 2013 crew 4x4 is available with both 3.73 as the norm or option 4:10 I got the 4:10 cuz I knew I wanted to get larger tires. But what I don't understand is either way the truck came with the same 245/75/17 tires!!! So something doesn't make sense to me? If its the same tires with diff gear ratios then it must have been engineered to drive the same with both 373 pr 410 ratios, right? I mean did I do good getting 4:10 if I'm going to run 35 tires? My point as a dummie is if it drives the same with both gear ratios and tires then how much can it help with the 35's? (was thinking 33 but only gives me 1 1/2 inch taller which is only 3/4 inch more clearance, hardly worth the effort) 35 gives me 3 1/2 or 1 3/4 inches that's good)

country_09

Meant to drive the same but pull different. Yes you did good by gettin the 4:10s for 35" tires. 35s and 3.73s sucks, with 4:10s it's much more bearable

tech2

soon as you go to those tires you probably lose at least 1000lbs off the towing capacity. Which is why all manufacuters don't run 20" rims on there top towing vehicles. They want to keep the towing numbers up.

cheaperrooter

Tech 2, Should have clarified, but I didn't think anybody was putting my other post together with this one. Thank you for having an excellent memory!!! I'm no longer getting the 6 inch and 35 deal at dealer, just thought that 6 inches was overkill and would wear things out faster. I'm now going with aftermarket 4 inch, and 35. Which means also no 20 in h rims. However, I was unaware that rim size had anything to do with it. Was going to stay as stock as possible if not use OEM rims. All depends on what's available for those rims, my 2011 didn't have many tire options available for 17 inch rims. But I thought it had to do with circumference total, regardless of what rim I used. Guess I'm still missing something?

cheaperrooter

Going to try and go 305,70,17 which i think is avaialble, giving me about 33 1/2 inches on stock 17 inch rim. That should help the gearing much better than 35's and still give me a little over an inch clearance.

tech2

circumference is the issue.

f5fstop

Please explain further. A 20" wheel and tire combo can have the same circumference as a 18, 17 or 16 inch tire. Same size tires, as stated on the sidewall, might have a few tenths of a difference in circumference between manufacturers.

country_09

^ my thoughts exactly. Wheel circumference doesn't have anything to do with it, it's the size tire. You can run a 35x12.5x17 vs a 275/55/20 and the truck with 275/55s will out tow the other all day. It's tire size and weight. The 20s will weigh a tad more, but not enough to make a difference on a 6k pound truck.

I'd do a 4" lift on some 33s with your choice of wheel/tire combo. Look at the weight numbers of the wheel/tire you choose and go from there. 33s and 4.10s with a 6.0 isn't bad at all. Although I recommend gettin a custom tune to adjust speedo/mpg and give you more power.

tech2

to the op...I haven't read any of your other posts.


The tire circumference effects the final drive ratio of the truck. If you put on over sized tires the overall gear ratio goes down...is all i'm saying.