The codes listed below come from the Vehicle Certification Label which is typically attached to the door latch edge on the driver side door.

 

Axle Codes

L - Limited Slip Differential
C - Conventional Differential
Code Ratio
12 2.73C
16 3.73C
17 3.31C
18 3.06C
19 3.55C
23 3.54C
24 3.54C
25 4.10C
29 3.55C
31 3.73C
32 4.10C
33 (1992-1998) 3.54C
33 (1999-2002) 4.30C
34 3.73C
35 4.10C
36 4.56C
37 3.73C
39 3.55C
3J 3.55L
3L 3.73L
41 3.73C
41 (2006-2008) 4.10C
42 4.10C
43 4.30C
45 4.10C
46 4.56C
48 4.88C
49 3.55C
48 4.88C
4L 4.30L
4N 4.10L
4W 4.10L
52 4.10C
53 5.38C
56 4.10C
58 4.86C
5L 5.38L
61 3.73C
61 (2008) 6.17C
62 4.10C
63 4.30C
65 4.10C
66 4.56C
68 4.88C
69 3.55C
72 4.63C
73 (1996-2000) 5.13C
73 (2002-2004) 4.30C
75 (2002-2003 Motor home - Dana 80) Send us the ratio
75 5.38C
78 4.88C
81 3.73C
82 4.10C
83 4.30C
86 4.56C
88 4.88C
8L 4.88L
95 (2002-2003 Motor home - Dana 135) Send us the ratio
95 5.38C
98 4.88C
99  (2002 Motor home - Dana S150) Send us the ratio
99  (2003-2004 Motor home - Dana 145) Send us the ratio
B4 3.73L
B5 4.10L
B9 3.55L
C1 3.73L
C2 4.10L
C3 (1992-1998) 3.54L
C3 (1999-2005) 4.30L
C4 3.73L
C5 4.10L
C6 4.56L
C9 3.55L
D1 3.73L
D2 4.10L
D3 4.30L
D5 4.10L
D6 4.56L
E1 3.73L
E2 4.10L
E3 4.30L
E6 (1992-1998) 4.10L
E6 (1999-2002) 4.56L
EW (1992-1999) 4.10L
EW (2004 Ambulance) 4.10L
EW (2000-2002) 4.88L
F1 3.73L
F2 4.10L
F3 4.30L
F5 4.10L
F6 4.56L
F8 4.88L
G3 4.30L
G5 5.38L
G8 4.88L
GW (1997-2002) 4.10L
GW (2003-2004) 4.88L
H5 4.10L
H7 3.31L
H8 3.08L
H9 3.55L
K5 5.38L
K8 4.88L
KW (1997-2002, 2004) 4.10L
KW (2003) 4.88L
W5 4.00L

Transmission Codes

Code

 Model
B T199 (Mexico)
B (2003-2008) Five-speed automatic (5R110W)
B (2005) 4R75E
C M5HD/S5-42
E (1998-2005) 4R100
E (1992-1997) E4OD
F T-18
G C6
M M5OD-R2
S TR-3340 (Mexico)
T AOD
T (2006-2008) Five-speed automatic (5R110W)
U 4R70W
W M5HD-W/S5-47
2 (2002)  6-spd manual (Mexico)? Send us the ratio
2 (2003-2004)  5-spd manual (Mexico) ? Send us the ratio
2 (2005-2008) Five-speed manual, Tremac (TR4050)
5 (2002) 5-spd manual ? Send us the ratio
5 (2003-2008)  Six-speed manual, Dana (ZF S6-650 )
6 M6HD-6
6 (2003) M6HD-C
7 (2003-2008) Six-speed manual, Dana (ZF M6HD-W)
9 4R100
 

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