what gears
 

hey does anyone know what gears are in my 2003 Boss f150 its a 12 bolt and what gears should i put in 3:73/4:10 its an auto 4 speed....thanx

12bolt is Chevy. You have a Sterling 9.75

Post your axle code on the door jam sticker or google "ford axle codes"

Adrianspeeder

ok, you have the 3.55 rear end. i know. same truck different year. i've about made up my mind to go with 4.10s, just to help me get down the track a little faster.

really depends on your mods

There were some options on gear choices. Only way to know for sure is from the axle code or by inspection.

Adrianspeeder