ive got a 2000 f250 7.3l. i just ordered a 6 inch lift and cant decideon gears for it. ive got 3.73's in there now and the next size up isa 4.11. should i change the gears for the bigger ones with a 36 or 37inch tire on there? if i go with the 4.11's then what is that going to do to my gas milage? should it stay about the same as if it is stock or get better or worse? thanks

 

http://www.4wheelparts.com/gear_ratio.html

This chart might help.