GM Service Manual Online
For 1990-2009 cars only
Table 1: Pinion Shim Calculation Table with an A1 Value Greater Than 111.00 mm (4.37 in)
Table 2: Drive Pinion Shim Calculation Table with an A1 Value Less Than 111.00 mm (4.37 in)
Table 3: Differential Case Right Side Shim Calculation Table with an A2 Value Greater Than 63.5 mm (2.5 in)
Table 4: Differential Case Right Side Shim Calculation Table with an A2 Value Less Than 63.5 mm (2.5 in)

Pinion Shim Calculation Table with an A1 Value Greater Than 111.00 mm (4.37 in)

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

3.31 mm

0.130 in

--

--

B2 (B Nominal Value Minus B1 = B2)

1.69 mm

0.067 in

--

--

 

A1 Value (Taken from Ring Gear)

111.03 mm

4.371 in

--

--

A Nominal Value

111.00 mm

4.37 in

111.00 mm

4.37 in

B3 (A1 Value Minus A Nominal = B3)

0.03 mm

0.0012 in

--

--

 

B2

1.69 mm

0.0665 in

--

--

B3

0.03 mm

0.0012 in

--

--

Pinion Shim Size (B2 Plus B3 = Pinion Shim)

1.72 mm

0.0677 in

--

--


Drive Pinion Shim Calculation Table with an A1 Value Less Than 111.00 mm (4.37 in)

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

3.31 mm

0.130 in

--

--

B2 (B Nominal Value Minus B1 = B2)

1.69 mm

0.067 in

--

--

 

A1 Value (Taken from Ring Gear)

110.97 mm

4.369 in

--

--

A Nominal Value

111.00 mm

4.37 in

111.00 mm

4.37 in

B3 (A1 Value Minus A Nominal = B3)

-0.03 mm

-0.0011 in

--

--

 

B2

1.69 mm

0.067 in

--

--

B3

-0.03 mm

-0.0011 in

--

--

Pinion Shim Size (B2 Plus B3 = Pinion Shim)

1.66 mm

0.0654 in

--

--


Differential Case Right Side Shim Calculation Table with an A2 Value Greater Than 63.5 mm (2.5 in)

Calculations

Example Measurements

Actual Measurements

 

Metric

English

Metric

English

C Nominal Value for Differential Ratio of which is 3.42

5.00 mm

0.197 in

5.00 mm

0.197 in

C Nominal Value for Differential Ratio of which is 2.73

10.5 mm

0.413 in

10.5 mm

0.413 in

C1 Measured Value

3.10 mm

0.122 in

--

--

C2 (C Nominal Value Minus C1 = C2)

1.90 mm

0.075 in

--

--

 

A2 Value (Taken from Ring Gear)

63.53 mm

2.501 in

--

--

D Nominal Value

63.50 mm

2.5 in

63.5 mm

2.5 in

C3 (A2 Value Minus D Nominal = C3)

0.03 mm

0.0012 in

--

--

 

C2

1.90 mm

0.0748 in

--

--

C3

0.03 mm

0.0012 in

--

--

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

1.93 mm

0.0736 in

--

--


Differential Case Right Side Shim Calculation Table with an A2 Value Less Than 63.5 mm (2.5 in)

Calculations

Example Measurements

Actual Measurements

 

Metric

English

Metric

English

C Nominal Value for Differential Ratio of which is 3.42

5.00 mm

0.197 in

5.00 mm

0.197 in

C Nominal Value for Differential Ratio of which is 2.73

10.5 mm

0.413 in

10.5 mm

0.413 in

C1 Measured Value

3.10 mm

0.122 in

--

--

C2 (C Nominal Value Minus C1 = C2)

1.90 mm

0.75 in

--

--

 

A2 Value (Taken from Ring Gear)

63.47 mm

2.499 in

--

--

D Nominal Value

63.5 mm

2.5 in

63.5 mm

2.50 in

C3 (A2 Value Minus D Nominal = C3)

-0.03 mm

-0.0012 in

--

--

 

C2

1.90 mm

0.0748 in

--

--

C3

-0.03 mm

-.0012 in

--

--

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

1.87 mm

0.0736 in

--

--