ok my truck as far as i know is stock in the gears department.
i get like 14mpg (4.6l 4x4 auto, 97 xcab) average right now with 285/75/16's. eventually i want to run 315/75/16's when i get a 6" lift. what would be a good gearing to run? i do probably 50/50 highway and town driving. since town is only 5 mins either direction.

i want to keep some power to get and go (not like i have much now), pretty much just a happy medium.

 

what is your gearing now 3.55, 3.73, 3.05 ? this makes a big diffrence on what my anser would be to you, you can check the door code or you can check the tag on the rear diff to find out

 

i looked at the tag on the door being cold wet and dark outside. the code says H9 under the |axle|...but to me that means nothing since i have no clue of what it is.

 

here are the axle codes
18 - 3.08
19 - 3.55
26 - 3.73
27 - 3.31
H9 - 3.55 Limited Slip
B6 - 3.73 Limited Slip

 

if you still want to get good highway miles i would go with 4.10, if you want more power and towing go with 4.56 you will lose some on highway but you might gain some in city

 

ok thanks bigtruck311

 

no problem

 

big truck i have 285-75-16 tires i might do 4.10 gears do u kno what i would be getting for highway rpms around 60 mph???

 

these guys have a ratio chart on there site it is on the left just click on a tire and you will see the ratio chart, it will be off some but it should be close, www.4wheelparts.com