GM Service Manual Online
For 1990-2009 cars only
Table 1: Pinion Shim Calculation Table with an A1 Value Greater Than 103.00 mm (4.055 in) All Axle Ratios
Table 2: Pinion Shim Calculation Table with an A1 Value Less Than 103.00 mm (4.055 in) All Axle Ratios
Table 3: Differential Case Left Side Shim Calculation Table with an A2 Value Greater Than 74.50 mm (2.933 in) All Axle Ratios
Table 4: Differential Case Left Side Shim Calculation Table with an A2 Value Less Than 74.50 mm (2.933 in) All Axle Ratios

Pinion Shim Calculation Table with an A1 Value Greater Than 103.00 mm (4.055 in) All Axle Ratios

Calculations

Example Measurements

Actual Measurements

Metric

English

Metric

English

B Nominal Value

5.00 mm

0.197 in

5.00 mm

0.197 in

B1 Measured Value

3.44 mm

0.135 in

 

 

B2 (B Nominal Value Minus B1 = B2)

1.56 mm

0.061 in

 

 

 

A1 Value (Taken from Ring Gear)

103.03 mm

4.056 in

 

 

A Nominal Value

103.00 mm

4.055 in

103.00 mm

4.055 in

B3 (A1 Value Minus A Nominal = B3)

0.03 mm

0.0012 in

 

 

 

B2

1.56 mm

0.061 in

 

 

B3

0.03 mm

0.0012 in

 

 

Pinion Shim Size (B2 Plus B3 = Pinion Shim)

1.59 mm

0.0622 in

 

 


Pinion Shim Calculation Table with an A1 Value Less Than 103.00 mm (4.055 in) All Axle Ratios

Calculations

Example Measurements

Actual Measurements

Metric

English

Metric

English

B Nominal Value

5.00 mm

0.197 in

5.00 mm

0.197 in

B1 Measured Value

3.44 mm

0.135 in

 

 

B2 (B Nominal Value Minus B1 = B2)

1.56 mm

0.061 in

 

 

 

A1 Value (Taken from Ring Gear)

102.97 mm

4.054 in

 

 

A Nominal Value

103.00 mm

4.055 in

103.00 mm

4.055 in

B3 (A1 Value Minus A Nominal = B3)

-0.03 mm

-0.0011 in

 

 

 

B2

1.56 mm

0.061 in

 

 

B3

-0.03 mm

-0.0011 in

 

 

Pinion Shim Size (B2 Plus B3 = Pinion Shim)

1.53 mm

0.0599 in

 

 


Differential Case Left Side Shim Calculation Table with an A2 Value Greater Than 74.50 mm (2.933 in) All Axle Ratios

Calculations

Example Measurements

Actual Measurements

Metric

English

Metric

English

C Nominal Value

5.00 mm

0.197 in

5.00 mm

0.197 in

C1 Measured Value

1.19 mm

0.047 in

 

 

C2 (C Nominal Value Minus C1 = C2)

3.81 mm

0.15 in

 

 

 

A2 Value (Taken from Ring Gear)

74.53 mm

2.934 in

 

 

D Nominal Value

74.50 mm

2.933 in

74.50 mm

2.933 in

C3 (A2 Value Minus D Nominal = C3)

0.03 mm

0.0012 in

 

 

 

C2

3.81 mm

0.15 in

 

 

C3

0.03 mm

0.0012 in

 

 

Left Side Case Shim (C2 Plus C3 = Left Side Shim)

3.84 mm

0.1512 in

 

 


Differential Case Left Side Shim Calculation Table with an A2 Value Less Than 74.50 mm (2.933 in) All Axle Ratios

Calculations

Example Measurements

Actual Measurements

Metric

English

Metric

English

C Nominal Value

5.00 mm

0.197 in

5.00 mm

0.197 in

C1 Measured Value

1.19 mm

0.047 in

 

 

C2 (C Nominal Value Minus C1 = C2)

3.81 mm

0.15 in

 

 

 

A2 Value (Taken from Ring Gear)

74.47 mm

2.932 in

 

 

D Nominal Value

74.50 mm

2.933 in

74.50 mm

2.933 in

C3 (A2 Value Minus D Nominal = C3)

-0.03 mm

-0.0012 in

 

 

 

C2

3.81 mm

0.15 in

 

 

C3

-0.03 mm

-0.0012 in

 

 

Left Side Case Shim (C2 Plus C3 = Left Side Shim)

3.78 mm

0.1498 in