I recently purchased a 2002 F350 w/ 7.3 PS diesel. I want to determine the rear gear ratio, but the door sticker is wore off. I pulled these numbers off the differential tag:

3 V 423 B (top row)
3L73 10 5 2B21 (bottom row)

Can anyone identify the ratio from these numbers?

Sorry, I should have gotten the VIN number too.

 

you should have a 3.73 limited slip,thats if it has not been changed.

 

Thanks smithrngr,

I am confident it has never been changed. I thought Ford may have put some 4.10's in some of the F350's but maybe just in the V10's. Do you think the numbers 3L73 on the tag represent the gear ratio, by any chance?

 

A diesel 250 was only equipped with 3.73 LS.

 

the 7.3 only came with the 3.37.

Also if memory serves, you have a sterling rear end and a dana 60 front as apposed to pre-2002 models.

Can anyone confirm that for me?

 

3.73. Otherwise, yes the rest seems accurate. I do think that a few early 2002 models had Dana 50 front axles installed with leftover inventory from the past year.

 

Whoops, typo. Thanks!