way big, I'd go 4.56 gears at least.

315x75x16=34.6"

 

so i should at least do 4.56s?

 

For 35" yes.

 

yes, maybe even 4.88's for a little performance bump.

 

will that mess my mileage up

 

He should do find there is a little wiggle room for him.

 

for 4.56 or 4.88

 

If you're currently running 3.55 stock gearing on 35" tires, then either 4.56s or 4.88s are going to help over your current setup. 4.56s will be the most fuel efficient.

Your tranny probably curses at you under it's breath every time you turn the key, LOL!

 

Plus I can't find 4.88 gear sets with install kits.

 

ya im gettin 12 mpg now lol