I would like to keep 16" wheels and go with the BF Goodrich AT K/Os, but go up a size or two (say a max of 32") on tires. With an automatic transmission, will this affect performance and MPG?

I checked the ratio charts, but they don't really tell me what I need to know, or maybe they do and I am just an awful newbie! either way. thanks guys.

also, this vehicle is my daily driver.

brian

 

Well...

I can tell you my results.
2010 Automatic 2 Door with 3.73's Bone Stock: 15.5 -16mpgs

2010 Automatic 2 Door with 3.73's Rubicon Tires (31.6") and Wheels (17"): 12.5 -14mpgs

Maybe, you get better gas mileage depending on your style of driving and terrain.

(edit: if you want to know the performance difference, it's not very noticeable. I DO HATE that it shifts up and down right at 69MPH, which happens to be around the MPH everyone drives here on the Freeways.)

 

This is similar to mine. I have been computing my own mileage based off my current stock tires P225/75R16, and have gotten 15.8, 15.2 and 15.8 for my past three fill-ups.

That's a decent drop in MPG for 3 inches!

 

I have the 2dr rubi, 4.10 and 32" tires. I get 20 ~ 22 on highway and 15 ~ 16 city. If that helps.

 

IMHO for your auto/3:73 JK ..... 33's would be tops before you see peformance and MPG go for a crapper.

 

I would agree-lost 2-3 mpg's when I went to 33's with 3.73 auto

 

I am running Goodyear Duratrac 275/70R18's with that setup

 

I have a 09 4 door with 3:73's and auto and I've been running General Grabber AT2's 285/75/16 for over a year now and get 15 to 17 mpg. I get around 300 to 330 miles to a tank of gas. (that's when the gas light comes on). That's a combo of freeway driving and driving up and down the mountain 4 days a week. I live at 6200 feet. I cruise on the freeway at 75 mph at about 2000 rpm. Mine never downshifts unless i hit a pretty good grade. I have everything reprogrammed with the AEV ProCal.

 

Goodyear wangler S/T 225 75 16 Diameter 29.29 Crossection 8.78 Tread 7.02

BFGoodrich All-Terrain T/A KO Diameter 30.61 Crossection 10.71 Tread 9.10
LT265/70R16/D rated, 2 to 3 mph in speed difference 65 on speed will be 67 to 69 in actual mph.


33

 

Thanks for all of your help on this guys! Should look pretty sweet.

Here's another one. i want those cragar rims...but there are no local dealers for me (mississippi) and quadratec doesn't sell the right lug patterns. our local tire/wheel store said they can only ship what they represent. i wonder if quadratec would make a special order?

either way, thanks for the insight

brian