DIFFERENTIAL IDENTIFICATION

If you have the axle code of your vehicle, it is easy to find out what size differential, what ratio, and what pinion set-up you have.  This will also help if you are hunting for a particular unit off another vehicle.  The axle code is in the vehicle ID plate under the hood or drivers door. The axle code is 4 digits: a letter followed by 3 numbers.

Example:  F372 =  7.5" 3.58 final ratio 2 pinion

1ST DIGIT

R&P SIZE

2nd/3rd Digit

R&P RATIO

4th DIGIT

PINION SET-UP

A

138mm

O1

3.30

2

2 pinion

B

145mm

O2

3.36

3

2 pinion LSD

C

6.25"

O3

3.55

4

4 pinion

D

6.62"

O4

3.56

5

4 pinion LSD

E

7.1"

O5

3.70

F

7.5"

O6

3.89

G

8.0"

O7

3.90

H

9.0"

O8

4.11

J

9.25"

O9

4.22

K

9.5"

10

4.38

L

10.5"

11

4.44

M

12.5"

12

4.63

N

13.5"

13

4.79

P

14"

14

4.88

R

162mm

15

5.13

S

6.38"

16

5.29

T

6.7"

17

5.60

U

6"

18

5.71

V

10.6"

19

5.83

W

15.5"

20

6.17

X

142mm

21

6.67

Y

158mm

22

6.78

23

6.83

24

7.64

25

4.56

26

5.57

27

3.36

28

4.30

29

4.10

30

3.73

31

3.91

32

6.59

33

7.50

34

6.78

35

7.64

36

4.78

37

3.58

38

3.42