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Ford Differential Axle Codes Do I have a positraction, what is my rear differential ratio?		2000-2002 Excursion 2000-2002 F53 Motor Home 1997-2002 F-250/350 (Over 8500 pounds GVWR) 1999-2002 F-450/550, Motor Home 1992-1997 F-Super Duty 1992-1996 F-Series
Identifying Vehicles Equipped with OE Traction Adding Differentials		Ford Differential Parts and Accessories Ford 7.5" Rear End Parts & Accessories Ford 8.8" Rear End Parts & Accessories Ford 9" Rear End Parts & Accessories Ford 10.25" Rear End Parts & Accessories
Ford cars and trucks from 1968 on have an axle code on the Certification Plate that can be used to determine if the vehicle is factory equipped with a limited slip differential. The Certification Plate can be located on the lock face of the left door edge. The plate layouts vary depending on the year, but in every case the axle code section is clearly marked as either "axle" or "ax". Ford axles codes contain one or two character. Any code beginning with a letter (an alpha code) indicates the vehicle is equipped with a limited slip differential EXCEPT as shown below. Some trucks with axle codes that are numbers only (numeric codes) are equipped with limited slip differentials. Please refer to the information below:
Differential cover/cover gasket shapes a common technique to determine ring gear diameter.		Dana/Spicer Differential Parts bill of material number an excellant method to determine correct parts that are required.

Code	Positraction	Ratio
12	Conventional non-Positraction Differential	2.73
16	Conventional non-Positraction Differential	3.73
17	Conventional non-Positraction Differential	3.31
18	Conventional non-Positraction Differential	3.06
19	Conventional non-Positraction Differential	3.55
23	Conventional non-Positraction Differential	3.54
24	Conventional non-Positraction Differential	3.54
25	Conventional non-Positraction Differential	4.10
29	Conventional non-Positraction Differential	3.55
31	Conventional non-Positraction Differential	3.73
32	Conventional non-Positraction Differential	4.10
33 (1992-1998)	Conventional non-Positraction Differential	3.54
33 (1999-2002)	Conventional non-Positraction Differential	4.30
34	Conventional non-Positraction Differential	3.73
35	Conventional non-Positraction Differential	4.10
36	Conventional non-Positraction Differential	4.56
39	Conventional non-Positraction Differential	3.55
41	Conventional non-Positraction Differential	3.73
42	Conventional non-Positraction Differential	4.10
43	Conventional non-Positraction Differential	4.30
45	Conventional non-Positraction Differential	4.10
46	Conventional non-Positraction Differential	4.56
49	Conventional non-Positraction Differential	3.55
52	Conventional non-Positraction Differential	4.10
56	Conventional non-Positraction Differential	4.10
58	Conventional non-Positraction Differential	4.86
61	Conventional non-Positraction Differential	3.73
62	Conventional non-Positraction Differential	4.10
63	Conventional non-Positraction Differential	4.30
65	Conventional non-Positraction Differential	4.10
66	Conventional non-Positraction Differential	4.56
68	Conventional non-Positraction Differential	4.88
69	Conventional non-Positraction Differential	3.55
72	Conventional non-Positraction Differential	4.63
73 (1996-2000)	Conventional non-Positraction Differential	5.13
73 (2002)	Conventional non-Positraction Differential	4.30
75 (2002 Motor home - Dana 80)	Conventional non-Positraction Differential	Supply Bill of Material Number
75	Conventional non-Positraction Differential	5.38
78	Conventional non-Positraction Differential	4.88
81	Conventional non-Positraction Differential	3.73
82	Conventional non-Positraction Differential	4.10
83	Conventional non-Positraction Differential	4.30
86	Conventional non-Positraction Differential	4.56
88	Conventional non-Positraction Differential	4.88
95 (2002 Motor home - Dana 135)	Conventional non-Positraction Differential	Supply Bill of Material Number
95	Conventional non-Positraction Differential	5.38
98	Conventional non-Positraction Differential	4.88
B4	Limited Slip Differential	3.73
B5	Limited Slip Differential	4.10
B9	Limited Slip Differential	3.55
C1	Limited Slip Differential	3.73
C2	Limited Slip Differential	4.10
C3 (1992-1998)	Limited Slip Differential	3.54
C3 (1999-2002)	Limited Slip Differential	4.30
C4	Limited Slip Differential	3.73
C5	Limited Slip Differential	4.10
C6	Limited Slip Differential	4.56
C9	Limited Slip Differential	3.55
D1	Limited Slip Differential	3.73
D2	Limited Slip Differential	4.10
D3	Limited Slip Differential	4.30
D5	Limited Slip Differential	4.10
D6	Limited Slip Differential	4.56
E1	Limited Slip Differential	3.73
E2	Limited Slip Differential	4.10
E3	Limited Slip Differential	4.30
E6 (1992-1998)	Limited Slip Differential	4.10
E6 (1999-2002)	Limited Slip Differential	4.56
EW (1992-1999)	Limited Slip Differential	4.10
EW (2000-2002)	Limited Slip Differential	4.88
F1	Limited Slip Differential	3.73
F2	Limited Slip Differential	4.10
F3	Limited Slip Differential	4.30
F5	Limited Slip Differential	4.10
F6	Limited Slip Differential	4.56
F8	Limited Slip Differential	4.88
G3	Limited Slip Differential	4.30
G5	Limited Slip Differential	5.38
G8	Limited Slip Differential	4.88
GW	Limited Slip Differential	4.10
H5	Limited Slip Differential	4.10
H7	Limited Slip Differential	3.31
H8	Limited Slip Differential	3.08
H9	Limited Slip Differential	3.55
K5	Limited Slip Differential	5.38
K8	Limited Slip Differential	4.88
KW	Limited Slip Differential	4.10
W5	Limited Slip Differential	4.00

The following figure presents differential cover/cover gasket shapes. Counting cover bolts and cover shapes is a common method to determine which ring gear diameter differential you have in your rear wheel drive vehicles. See following paragraph for selection of correct Dana parts

When ordering Dana/Spicer Differential Parts provide bill of material number. This number is stamped on your right hand side axle tube. It's a number like 603XX-X, 604XX-X or 605XX-X. With this number you can tell exactly what components the factory used in the assembly of your differential. Plug the bill of material number in Dana's site, information is also provided should you want to change gear ratio.

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