Superduty Axle codes...
 

Want to know what gears you have, a LS or not...

Here ya go...

Superduty Codes

F350 duallys

61 - open - 3.73
62 - open - 4.10
63 - open - 4.30
F1 - Limited slip - 3.73
F2 - Limited slip - 4.10
F3 - Limited slip - 4.30

F350 SRW

41 - open - 3.73
42 - open - 4.10
43 - open - 4.30
D1 - L/S - 3.73
D2 - L/S - 4.10
D3 - L/S - 4.30

F250 & Excursion

31 - open - 3.73
32 - open - 4.10
33 - open -4.30
C1 - L/S - 3.73
C2 - L/S - 4.10
C3 - L/S - 4.30

Maybe I'm just not seeing it but mine says, (3 S 409 H) then on the second line it says (3L 73 10 5 0A19).

The axle code is on the VIN label on the door jamb...not the axle tag.

It's the dealer option code on what the truck was originally ordered with---not necessarily what is actually in the truck (if someone swapped, etc...)

Yeah I checked and the space below axle is blank.

so basically as long as I have a similar year I can put in a srw 3.73 axle in that's all I need to know I couldn't find my code had to call the dealer in town with the vin number.