How would I figure out what gears I have in my truck? Would it be through the VIN #??

Im am pretty sure they are 3.55, but got the truck used, so I dont know....

 

If it is still there, there is a tag on the door with a code.

Then check this thread.

https://www.f150online.com/forums/ot...-rear-end.html

 

yup

19 — 3.55 non-limited slip — F-150
25 — 4.10 non-limited slip — F-150
26 — 3.73 non-limited slip — F-150/Mark LT
27 — 3.31 non-limited slip — F-150
B5 — 4.10 limited slip — F-150
B6 — 3.73 limited slip — F-150/Mark LT
H9 — 3.55 limited slip — F-150
18 = 3.08 non-limited slip — F-150

more then likely you have 3.55 open, but you might be lucky and have 3.73 LS

 

ok. thanks guys! i will check that out in a sec when i go to get my new alarm looked at for some small problems...

what would help get the better mileage? i would say the 3.55, since is a smaller ratio...right?

 

It's is stated backwards. The higher RATIO is the lower number. The best mileage and best gear ratio depends on some factors. How you drive, city or highway, weight of vehicle, and size of engine. In other words, the least strain with the lowest engine rpms will result in the best gas mileage. If you are doing all city driving with a heavy vehicle, 3.73s might do better than 3.30s or 3.55s. Just depends.

 

ok. i just hope that i have 3.55's because this is what i told Justin @ VMP when i ordered my tunes...:o

i wonder what he will say if i come back and tell him i had the wrong gears....

 

I bet it allows you to change the gears just like tires. He will set it as the default, but you can change it. The Gryphon is that way.

 

i just hope i dont have to owe anything. someone said that if you misread info about the truck, or get a small new mod within the first couple of months, he rewrites it for free....

 

so say i wanted to look into doing a gear swap to improve mileage, what gears should i look into, and about how much would it set me back?? if you dont know, thats fine...

 

what motor have you got? Planning on keeping the stock tire size or going bigger?

If you're going to stay stock, I'd look at 4.10s

 

i plan on eventually getting 18's, but for now they are staying stock. i have a 2001 4.2L 2WD Scab.

i drive 600+ miles when i go home for the weekend, and i do alot of running around town when im at school.