Ford Differential Axle Codes . Do I have a positraction, what is my rear differential ratio?
What gear ratio do I have? Do I have a positraction? Ford Differential Axle Codes
Identifying Ford Vehicles Equipped with OE Traction Rear Ends

Ford cars and trucks from 1968 on have an axle code on the Certification Plate, information on this plate can be used to determine if you vehicle is factory equipped with a limited slip positraction rear end - differential. The certification plate can be located on the lock face of the left door edge. The plate layouts vary depending on the model 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 pickup trucks with axle codes that are numbers only (numeric codes) are equipped with limited slip differentials. If you need positraction replacements and or parts see this link.

Positraction |
Ratio |
|
005-J | Limited Slip Differential | 3.27 |
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 |
026-F | Conventional non-Positraction Differential | 2.73 |
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 |
040-L | Conventional non-Positraction Differential | 3.08 |
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 |
054-J | Conventional non-Positraction Differential | 3.27 |
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 |
102-A | Conventional non-Positraction Differential | 3.31 |
113-A | Limited Slip Differential | 3.73 |
114-A | Conventional non-Positraction Differential | 3.73 |
126-N | Conventional non-Positraction Differential | 3.55 |
127-N | Limited Slip Differential | 3.55 |
130-N | Conventional non-Positraction Differential | 4.10 |
131-N | Limited Slip Differential | 4.10 |
168-S | Conventional non-Positraction Differential | 4.10 |
169-S | Limited Slip Differential | 4.10 |
189-S | Conventional non-Positraction Differential | 4.10 |
192-S | Limited Slip Differential | 4.10 |
199-R | Limited Slip Differential | 4.10 |
203-B | Limited Slip Differential | 2.73 |
209-E | Limited Slip Differential | 3.27 |
221-C | Limited Slip Differential | 2.73 |
223-C | Limited Slip Differential | 2.73 |
225-C | Limited Slip Differential | 3.08 |
227-C | Limited Slip Differential | 3.08 |
229-C | Limited Slip Differential | 3.27 |
231-C | Limited Slip Differential | 3.27 |
262-C | Conventional non-Positraction Differential | 2.73 |
264-C | Conventional non-Positraction Differential | 2.73 |
348F | Conventional non-Positraction Differential | 3.27 |
350-F | Conventional non-Positraction Differential | 3.08 |
352-F | Conventional non-Positraction Differential | 3.08 |
354-F | Conventional non-Positraction Differential | 3.73 |
355-F | Limited Slip Differential | 3.55 |
356-F | Conventional non-Positraction Differential | 3.27 |
357-F | Limited Slip Differential | 3.55 |
359-F | Limited Slip Differential | 3.73 |
362-F | Conventional non-Positraction Differential | 3.45 |
363-F | Limited Slip Differential | 3.73 |
366-F | Conventional non-Positraction Differential | 3.45 |
367-F | Limited Slip Differential | 3.73 |
368-F | Conventional non-Positraction Differential | 3.73 |
370-F | Conventional non-Positraction Differential | 3.73 |
371-F | Limited Slip Differential | 4.10 |
372-F | Conventional non-Positraction Differential | 4.10 |
374-F | Conventional non-Positraction Differential | 4.10 |
430-F | Conventional non-Positraction Differential | 3.07 |
434-F | Conventional non-Positraction Differential | 3.27 |
501-F | Limited Slip Differential | 3.27 |
502-F | Conventional non-Positraction Differential | 3.27 |
511-F | Limited Slip Differential | 3.27 |
515-F | Conventional non-Positraction Differential | 3.27 |
610-B | Conventional non-Positraction Differential | 3.27 |
612-B | Conventional non-Positraction Differential | 3.55 |
613-B | Limited Slip Differential | 3.73 |
614-B | Conventional non-Positraction Differential | 3.73 |
615-C | Limited Slip Differential | 4.10 |
616-B | Conventional non-Positraction Differential | 4.10 |
619-A | Limited Slip Differential | 3.37 |
621-A | Limited Slip Differential | 3.73 |
625-A | Limited Slip Differential | 3.27 |
668-H | Conventional non-Positraction Differential | 4.10 |
674-F | Conventional non-Positraction Differential | 3.55 |
675-F | Limited Slip Differential | 3.55 |
696-H | Conventional non-Positraction Differential | 3.73 |
697-H | Limited Slip Differential | 3.73 |
699-H | Limited Slip Differential | 4.10 |
710-A | Conventional non-Positraction Differential | 3.55 |
711-A | Limited Slip Differential | 3.55 |
740-P | Conventional non-Positraction Differential | 3.31 |
746-A | Conventional non-Positraction Differential | 3.55 |
747-A | Limited Slip Differential | 3.55 |
802-C | Conventional non-Positraction Differential | 3.31 |
820-C | Conventional non-Positraction Differential | 3.55 |
821-C | Limited Slip Differential | 3.31 |
825-C | Limited Slip Differential | 3.55 |
832-J | Conventional non-Positraction Differential | 3.31 |
833-J | Limited Slip Differential | 3.31 |
835-J | Limited Slip Differential | 3.08 |
845-M | Limited Slip Differential | 4.10 |
852-A | Conventional non-Positraction Differential | 3.08 |
862-B | Conventional non-Positraction Differential | 3.55 |
869B | Limited Slip Differential | 3.55 |
900-A | Conventional non-Positraction Differential | 3.08 |
908-A | Conventional non-Positraction Differential | 3.55 |
909-A | Limited Slip Differential | 3.55 |
930-A | Conventional non-Positraction Differential | 3.31 |
935-C | Limited Slip Differential | 3.73 |
947F | Conventional non-Positraction Differential | 4.63 |
948F | Conventional non-Positraction Differential | 5.13 |
950-A | Conventional non-Positraction Differential | 3.08 |
954-A | Conventional non-Positraction Differential | 3.31 |
956-A | Conventional non-Positraction Differential | 3.55 |
958-A | Conventional non-Positraction Differential | 3.73 |
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 |
D403A | Conventional non-Positraction Differential | 3.54 |
D404A | Conventional non-Positraction Differential | 3.73 |
D454A | Limited Slip Differential | 3.73 |
D607A | Conventional non-Positraction Differential | 4.10 |
D615J | Conventional non-Positraction Differential | 4.09 |
D630J | Conventional non-Positraction Differential | 3.54 |
D631A | Conventional non-Positraction Differential | 4.10 |
D632A | Conventional non-Positraction Differential | 3.73 |
D654A | Limited Slip Differential | 3.54 |
D808A | Limited Slip Differential | 4.10 |
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.