Hi guys, I'm new to the form. I just purchased a 2009 f250 4x4 diesel and am curious to know if there is a way I can find out what the gears/ratio are for the rear axle?
Thanks

 

Door Cert will indicate the code. Look for it. I have 3L for 3.73 LS.

 

4L is 4.30 but you won't have that. Either 3.73 or 3.31 most likely. Probably the latter as they were trying to get some better fuel mileage by 09.

 

Thank you

 

Nice looking truck.

 

When I ordered my 09 6.4L SRW F350, the only rear gear options were 3.55 or 3.73 (unless you got DRW). 3.73 got you 20" rims at an extra $2000 and the 3.55s came with the 18s. I chose to keep the $2000. Assuming nothing has been changed, the wheel size should tell you what you have. The only way to get more gear was with a F350 Dually (4.10 or 4.30).

I just pulled up my 09 towing guide and verified.
The 5.4 engine gave you the choice of 3.73 or 4.10.
The 6.8 engine gave you the choice of 4.10 or 4.30.

And based on the wheels in your avatar pic, you have the 20s and 3.73 gears.

 

Thank you Mystic. Thanks to this website ( http://researchmaniacs.com/VIN-Number-Lookup/WindowSticker/Ford.html ) I found out that you are correct, I do have 3.73 gears. Plus a couple other options that I didn't know about.

 

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