I have 15x7 rims, i can get 31x10.5x15's right?

 

yup

 

well take it from me, I have 31's I drove with 3.73 gears and now with 4.10 gears. You can tell the difference. Now it doesn't seem any faster but damn do you have more torque with the 4.10's If I had the chance I would put 4.56 gears in my truck with just 31's. I don't do any highway driving really so i could deal with just doing 70 75 max.

 

The biggest tire i will get for my ranger is 33's whenever i get more money. so do yall think i should go ahead and get the 4.10's or think ahead and get 4.56's? and on summit its says the ring and pinion gears require a special cross pin, do i need it also?