cant figure out what gears i have in truck.
so i bought my truck about a year ago and still cant figure out what gears it has. my boss thinks there 4.10. i looked at the chart that is posted. but that just confused me. im runnin 33's. when i go 65 (at least i think its 65, over sized tires messed with speedometer) do i turn o/d on or off? with it on my rpm is right around 2100 or 2200. with it off its well over the 3 thousand. i look up the code and it says from the factory it had 3.73. but like i said earlier my boss swears that is has 4.10. the reason i want to know so bad is im thinking about putting 35's on and i wanna make sure i have the right rears for it. another reason to lead me to believe there not stock is the guy before me put a ected locker in it. why would some one put a thousand dollar locker in and not do gears to? so if anybody could help me figure this out it would be awesome.
2007 xlt ranger reg cab, fll width Ford 8.8 rear, Dana 44 front, 5.13 gears, 37" toyos, pioneer double din deck, rockford fosgate speakers all the way around, custom mossy oak interior, cobra cb, custom stero in tool box(has its own power supply), Diablo intune programmed....Bunch of other stuff.