Axle Codes

Get the axle code from the sticker on the driver side door.

Ford Axle Codes, F-Series
Ratio Open Limited Slip Electronic Locking
3.15 15 N/A L5
3.31 27 N/A L3
3.55 19 H9 L9
3.73 26 B6 L6
4.10 N/A N/A L4

Ford Axles, F-150
Axle Code Axle Note Capacity Gear Ratio Splines Year / Vehicle
19 Ford Open 3800 3.55 31 F-150 / Expedition
26 Ford Open   3.73   F-150
B6 Ford/td> Limited Slip 5300 3.73   F-150
H9 Ford Limited Slip 3800 3.55 31 1982-2012 F-150
1991-2001 Explorer
1986-2014 Mustang
1982-1996 Bronco
1991-2011 Ranger
1985-2011 Panther platform
May have been used on the 1983-1986 Expedition
The Ford 8.8” is manufactured at the Sterling Axle Plant in Sterling Heights, MI. It was first used in model year 1983 Ford trucks.
L3 Ford Electronic Locking   3.31    
L4 Ford Electronic Locking   4.10    
L5 Ford Electronic Locking   3.15    
L6 Ford Electronic Locking   3.73E   F-150
L9 Ford Electronic Locking   3.55    
Information only, check with your dealer for accurate specifications.

Tip: count the lug nuts on one of the wheels.
If you have 7 you have the 10.25 differential.
If you have 6 nuts and a 5.4 engine you have the 9.75 differential.
If you have 5 and either a 4.6 or a 4.2 you have the 8.8 differential.