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: Side Gear Thrust Washer Selection

Ring Gear Backlash Shim Selection

Identification Mark

Available Shim Thickness

Metric

English

25

1.59 - 1.61 mm

0.0626 - 0.0646 in

26

1.62 - 1.64 mm

0.0638 - 0.0657 in

27

1.65 - 1.67 mm

0.0650 - 0.0657 in

28

1.68 - 1.70 mm

0.0661- 0.0669 in

29

1.71- 1.73 mm

0.0673 - 0.0681 in

30

1.74 - 1.76 mm

0.0685 - 0.0693 in

31

1.77 - 1.79 mm

0.0697 - 0.0795 in

32

1.80 - 1.82 mm

0.0709 - 0.0717 in

33

1.83 - 1.85 mm

0.0720 - 0.0728 in

34

1.86 - 1.88 mm

0.0732 - 0.0740 in

35

1.89 - 1.91 mm

0.0744 - 0.0752 in

36

1.92 - 1.94 mm

0.0756 - 0.0764 in

37

1.95 - 1.97 mm

0.0768 - 0.0776 in

38

1.98 - 2.00 mm

0.0780 - 0.0787 in

39

2.01 - 2.03 mm

0.0791 - 0.0799 in

40

2.04 - 2.06 mm

0.0803 - 0.0811 in

41

2.07 - 2.09 mm

0.0815 - 0.0823 in

42

2.10 - 2.12 mm

0.0827 - 0.0835 in

43

2.13 - 2.15 mm

0.0839 - 0.0846 in

44

2.16 - 2.18 mm

0.0850 - 0.0858 in

45

2.19 - 2.21 mm

0.0862 - 0.0870 in

46

2.22 - 2.24 mm

0.0874 - 0.0882 in

47

2.25 - 2.27 mm

0.0886 - 0.0894 in

48

2.28 - 2.30 mm

0.0898 - 0.0906 in

49

2.31 - 2.33 mm

0.0909 - 0.0917 in

50

2.34 - 2.36 mm

0.0921 - 0.0929 in

51

2.37 - 2.39 mm

0.0933 - 0.0941 in

52

2.40 - 2.42 mm

0.0945 - 0.0953 in

53

2.43 - 2.45 mm

0.0957 - 0.0965 in

54

2.46 - 2.48 mm

0.0969 - 0.0976 in

55

2.49 - 2.51 mm

0.0980 - 0.0988 in

56

2.52 - 2.54 mm

0.0992 - 0.1000 in

57

2.55 - 2.57 mm

0.1004 - 0.1012 in

58

2.58 - 2.60 mm

0.1016 - 0.1024 in

59

2.61 - 2.63 mm

0.1028 - 0.1035 in

60

2.64 - 2.66 mm

0.1039 - 0.1047 in

Drive Pinion Preload Shim Selection

Identification Mark

Available Shim Thickness

Metric

English

41

1.695 - 1.705 mm

0.0667 - 0.0671 in

42

1.705 - 1.715 mm

0.0671 - 0.0675 in

43

1.715 - 1.725 mm

0.0675 - 0.0679 in

44

1.725 - 1.735 mm

0.0679- 0.0683 in

45

1.735 - 1.745 mm

0.0683 - 0.0687 in

46

1.745 - 1.755 mm

0.0687 - 0.0691 in

47

1.755 - 1.765 mm

0.0691 - 0.0695 in

48

1.765 - 1.775 mm

0.0695 - 0.0699 in

49

1.775 - 1.785 mm

0.0699 - 0.0703 in

50

1.785 - 1.795 mm

0.0703 - 0.0707 in

51

1.795 - 1.805 mm

0.0707 - 0.0711 in

52

1.805 - 1.815 mm

0.0711 - 0.0715 in

53

1.815 - 1.825 mm

0.0715 - 0.0719 in

54

1.825 - 1.835 mm

0.0719 - 0.0722 in

55

1.835 - 1.845 mm

0.0722 - 0.0726 in

56

1.845 - 1.855 mm

0.0726 - 0.0730 in

57

1.855 - 1.865 mm

0.0730 - 0.0734 in

58

1.865 - 1.875 mm

0.0734 - 0.0738 in

59

1.875 - 1.885 mm

0.0738 - 0.0742 in

60

1.885 - 1.895 mm

0.0742 - 0.0746 in

61

1.895 - 1.905 mm

0.0746 - 0.0750 in

62

1.905 - 1.915 mm

0.0750 - 0.0754 in

63

1.915 - 1.925 mm

0.0754 - 0.0758 in

64

1.925 - 1.935 mm

0.0758 - 0.0762 in

65

1.935 - 1.945 mm

0.0762 - 0.0766 in

70

1.945 - 1.955 mm

0.0766 - 0.0770 in

71

1.955 - 1.965 mm

0.0770 - 0.0774 in

72

1.965 - 1.975 mm

0.0774 - 0.0778 in

73

1.975 - 1.985 mm

0.0778 - 0.0781 in

74

1.985 - 1.995 mm

0.0781 - 0.0785 in

75

1.995 - 2.005 mm

0.0785 - 0.0789 in

76

2.005 - 2.015 mm

0.0789 - 0.0793 in

77

2.015 - 2.025 mm

0.0793 - 0.0797 in

78

2.025 - 2.035 mm

0.0797 - 0.0801 in

79

2.035 - 2.045 mm

0.0801 - 0.0805 in

80

2.045 - 2.055 mm

0.0805 - 0.0809 in

81

2.055 - 2.065 mm

0.0809 - 0.0813 in

82

2.065 - 2.075 mm

0.0813 - 0.0817 in

83

2.075 - 2.085 mm

0.0817 - 0.0821 in

84

2.085 - 2.095 mm

0.0821 - 0.0825 in

85

2.095 - 2.105 mm

0.0825 - 0.0829 in

86

2.105 - 2.115 mm

0.0829 - 0.0833 in

87

2.115 - 2.125 mm

0.0833 - 0.0837 in

88

2.125 - 2.135 mm

0.0837 - 0.0841 in

89

2.135 - 2.145 mm

0.0841 - 0.0844 in

90

2.145 - 2.155 mm

0.0844 - 0.0848 in

91

2.155 - 2.165 mm

0.0848 - 0.0852 in

92

2.165 - 2.175 mm

0.0852 - 0.0856 in

93

2.175 - 2.0185 mm

0.0856 - 0.0860 in

94

2.185 - 2.195 mm

0.0860 - 0.0864 in

95

2.195 - 2.205 mm

0.0864 - 0.0868 in

Side Gear Thrust Washer Selection

Metric

English

1.48 - 1.52 mm

0.0583 - 0.0598 in

1.53 - 1.57 mm

0.0602 - 0.0618 in

1.58 - 1.62 mm

0.0622 - 0.0638 in

1.63 - 1.67 mm

0.0642 - 0.0657 in

1.68 - 1.72 mm

0.0661 - 0.0677 in

1.73 - 1.77 mm

0.0681 - 0.0697 in