OK guys i need some help, I have a 97 f250 4x4 automatic. I need help finding out what ratios in it. I run at 2000 rpm going 70 on 33x12.50's. I was told 4.10's but i don't think that is right. I need help quick. I have not had a chance to check the code, could some tell me exactly where to look? Thanks in advance for any help.

 

take your vin and go to any ford dealership. they should be able to punch in the vin and tell you *everything* about your truck.

if you cannot do that physically, there may be a way to do it online.

 

sounds like you have 3.55s, just check the tag on the diff cover

 

yeah, I have 4.10s and im usually around 2500rpm at 70mph. stock tires though 235/85 r16 i think

 

you have the 3.55. if you had a 4.10 your rpms at 70 would be about 2900rpm. you can also use this calculator to double check other things too, but i would bet you have a 3.55.


remember calculate the gear ratio, WITHOUT using overdrive as it is under a 1:1 ratio..

SummitRacing.com

 

the door tag has an axle code. google that code and ta da you have your answer. these either came with 3.55s or 4.10s, you have 3.55s

 

i have the sales receipt from my 1995 7.3 and it says it has the 4:10 gear ratio. but it was an extra with the truck. so it is possible but its more likely yoiu have the 3:73 gearing.

 

I have 4.10 and run 285/75r16 and at 70 mph I'm at 2300rpm. I have video....

 

no OBS pickups ame with 3.73s. the only options for the F250 and F350 were 3.55s or 4.10s