WHAT HAVE YOU FOUND?

IDENTIFYING FORD AXLE RATIOS…

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 is located on the lock face of the left door edge. 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:

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

Good friends and good times, that’s what the RRORC is all about.

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.