GM Service Manual Online
For 1990-2009 cars only
Table 1: Ring Gear Backlash Shim Selection
Table 2: Drive Pinion Preload Shim Selection
Table 3: Output Shaft Shim Selection

Ring Gear Backlash Shim Selection

Identification Mark

Available Shim Thickness

Metric

English

50

2.05 mm

0.0807 in

51

2.08 mm

0.0819 in

52

2.11 mm

0.0831 in

53

2.14 mm

0.0843 in

54

2.17 mm

0.0854 in

55

2.20 mm

0.0866 in

56

2.23 mm

0.0878 in

57

2.26 mm

0.0890 in

58

2.29 mm

0.0902 in

59

2.32 mm

0.0913 in

60

2.35 mm

0.0925 in

61

2.38 mm

0.0937 in

62

2.14 mm

0.0949 in

63

2.44 mm

0.0961 in

64

2.47 mm

0.0973 in

65

2.50 mm

0.0984 in

66

2.53 mm

0.0996 in

67

2.56 mm

0.1008 in

68

2.59 mm

0.1020 in

69

2.62 mm

0.1031 in

70

2.65 mm

0.1043 in

71

2.68 mm

0.1055 in

72

2.71 mm

0.1067 in

73

2.74 mm

0.1079 in

74

2.77 mm

0.1091 in

75

2.80 mm

0.1102 in

76

2.83 mm

0.1114 in

77

2.86 mm

0.1126 in

78

2.89 mm

0.1138 in

79

2.92 mm

0.1150 in

80

2.95 mm

0.1161 in

81

2.98 mm

0.1173 in

82

3.01 mm

0.1185 in

83

3.04 mm

0.1197 in

84

3.07 mm

0.1209 in

Drive Pinion Preload Shim Selection

Identification Mark

Available Shim Thickness

Metric

English

A0

2.47 mm

0.0972 in

A1

2.50 mm

0.0984 in

A2

2.53 mm

0.0996 in

A3

2.56 mm

0.1008 in

A4

2.59 mm

0.1020 in

A5

2.62 mm

0.1031 in

A6

2.65 mm

0.1043 in

A7

2.68 mm

0.1055 in

A8

2.71 mm

0.1067 in

A9

2.74 mm

0.1079 in

B0

2.77 mm

0.1091 in

B1

2.80 mm

0.1102 in

B2

2.83 mm

0.1114 in

B3

2.86 mm

0.1126 in

B4

2.89 mm

0.1138 in

B5

2.92 mm

0.1150 in

B6

2.95 mm

0.1161 in

B7

2.98 mm

0.1173 in

B8

3.01 mm

0.1185 in

B9

3.04 mm

0.1197 in

C0

3.07 mm

0.1209 in

C1

3.10 mm

0.1220 in

C2

3.13 mm

0.1232 in

C3

3.16 mm

0.1244 in

C4

3.19 mm

0.1256 in

C5

3.22 mm

0.1268 in

C6

3.25 mm

0.1280 in

C7

3.28 mm

0.1291 in

C8

3.31 mm

0.1303 in

C9

3.34 mm

0.1315 in

D0

3.37 mm

0.1327 in

D1

3.40 mm

0.1339 in

D2

3.43 mm

0.1350 in

D3

3.46 mm

0.1362 in

D4

3.49 mm

0.1374 in

D5

3.52 mm

0.1386 in

D6

3.55 mm

0.1398 in

D7

3.58 mm

0.1409 in

D8

3.61 mm

0.1421 in

D9

3.64 mm

0.1433 in

E0

3.67 mm

0.1445 in

E1

3.70 mm

0.1457 in

E2

3.73 mm

0.1469 in

E3

3.76 mm

0.1480 in

E4

3.79 mm

0.1492 in

E5

3.82 mm

0.1504 in

Output Shaft Shim Selection

Identification Mark

Available Shim Thickness

Metric

English

AA

2.10 mm

0.0827 in

AC

2.12 mm

0.0835 in

BB

2.14 mm

0.0843 in

CA

2.16 mm

0.0850 in

CC

2.18 mm

0.0858 in

DB

2.20 mm

0.0866 in

EA

2.22 mm

0.0874 in

EC

2.24 mm

0.0882 in

FB

2.26 mm

0.0890 in

GA

2.28 mm

0.0898 in

GC

2.30 mm

0.0906 in

HB

2.32 mm

0.0913 in

JA

2.34 mm

0.0921 in

JC

2.36 mm

0.0929 in

KB

2.38 mm

0.0937 in

LA

2.40 mm

0.0945 in

LC

2.42 mm

0.0953 in

MB

2.44 mm

0.0961 in

NA

3.46 mm

0.0969 in

NC

2.48 mm

0.0976 in

PB

2.50 mm

0.0984 in

QA

2.52 mm

0.0992 in

QC

2.54 mm

0.1000 in