unit505

A 235/75 15 tire is approximately 29.9". Going to a 31" tire will make your new final gear ratio a 3.68 and you will gain 2mph@55mph. Your speedo will read 55mph and you will actually be doing 57. You'll lose mpg slightly in stop and go traffic with 1" larger tires and gain mpg on longer speed sustained runs. At least that's the what the tire and gear conversion tables show. All of that factors with the weight of the old tire vs. the weight of the new tire and how close each one is to the stated tire size. Allot of tires say 31" but are either a little taller or a little shorter.

Jake1

Any advice on a good 31 tire to look into? Great input fellas thanks

sdmartin65

I used cc824 (light duty f250) and gained just below 1 1/2 ". Friend had the cc844 and way too stiff a ride for me!

f150cam

that question is like pulling teeth on this forum, your going to get 20 different tires, but it will come down to what you like.

me personally, i am in-love with the cooper discovery st and stt maxx.

jaytperry

well if i could choose the best tire I would grab a wrangler mtr, its durable and they have kevlar in the side walls. but since i am also on a strict budget i have to settle for the cooper tires, but its still a good tire. and its within a small budget. costs about 380 for two tires to be installed at big o.

mustangGT90210

Leveling won't effect your MPG, but the tires will. I noticed I lost 1 entire mpg when I went to 31s. But I also have 3.08 gears so you shouldn't even notice it

Jake1

Okay I am going to order the moog cc844 springs today. Will I need adjustable camber bushings while I'm in there? Are they necessary to re-align or would it be good to get just in case? Thank you

Jake1

Update! Springs ordered. Got them for $78 shipped of Ebay. Should be getting them put in next weekend. I thought since I was in there I would replace all tie rods and adjustment sleeves. Can anyone give suggestions on what brand or parts stores to look at as far as quality steering parts. I don't want to old junk with new junk. 5.0 2wd. Thank you

Jake1

Coils are in. Finally got around to replacing the stock coils and what a difference. The moog cc844 coils raised the front end almost 2in and improved the ride quality immensely. Great improvement. One last? On this issue. I know I can fit 31x10.5 but I can get a set of 31x12.5 for free from a buddy. Will they fit without rubbing or are they too wide? Thank you all for your replies

sylver91

If you have the stock rims on, the tires are gonna crown allot, more then 2" on each side. So yeah its gonna rub more then the 31"x10.5 tires

I would find wider offset rims.