I have a 6in lift on 35x13.5x18 and want to gear my truck but don't kno how big to go, what are my options

 

If 4wd 4.56 is most common for that tire size. Diffsonly.com has good pricing. Other options would be 4.10 or 4.88.

 

I though 4.10 for 35s and 4.56s for 37s I may be wrong though.

 

4.56, they will put you back closest to stock with the 35's.

 

I have 35's right now but plan to go with 37's when I get new tires, no time soon as I just it these, what would be a good gear with 35's but if I decide to go with 37's will work too? The thing I don't understand I that ppl say they run 70mph at like 2100-2300rpm, that doesn't sound too goo for mpg, right now I have 3.73 and 35's and run like 1750-1850

 

If you are eventually going to 37s the 4.56 will be best. You will lose some highway mpg with the new gears, but gain some city mpg. If you do mostly highway driving, the 3.73 will net you better mpg. The 4.10 ratio wouldn't be much of an improvement over the 3.73, not enough to justify 1500-2000 dollars it costs to upgrade.

 

Yah as of right now Im not too sure If I wanna step up to 37's. But I want to regear soon, I think I will go with 4.56 cause I don't do a lot of highway mostly city

 

4.56 will underwear you from stock by about 8% I think giving you a little more low end torque....That is what I went with and love it and glad as I am going to 37's shortly....

 

You said "underwear"....

 

I am running 4.56's with my 35's. A couple of my buddies are running the same. I agree that 4.10's would not be enough improvement to justify the cost. I would go 4.56 hands down. I love them. Of course its not going to get good freeway mileage. With oversized tires you are going to get shafted in either direction no matter what gears you go. 3.73's your city mileage is going to suck. 4.56's your freeway mileage is going to take a hit, but at least you are taking some of the strain off of your drivetrain. 4.88's are going to be way too much.