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What gear ratio do I have?  Do I have a positraction?  Ford Differential Axle Codes

Identifying Ford Vehicles Equipped with OE Traction Rear Ends

What rear end ratio does my Ford have?

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

One common technique to identifyitseasy.jpg differential ring gear diameters is cover - cover gasket shapes, to help you we have provided a list of possibilities.  We have also included link to assist you in determining what rear end you have, as well as a large list or rear end parts.
  need_ring_pinion.jpg
Ford installed a large number of Dana - Spicer differentials both in the front and the rear ends of their pickup trucks. When ordering parts for your Ford Dana rear end it is a critical to have that bill of material number to ensure that you find correct parts the first time.   A drawing showing how to locate the Dana bill of material number is provided.  

Axle Code

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 forddiffgaskets_large.jpgdifferential 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. 

billofmaterial_large.jpg


 

 
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