GM Service Manual Online
For 1990-2009 cars only
Table 1: Gear Teeth Counts and Ratios
Table 2: Blocking Ring Clearances
Table 3: Axial Play Specifications

Gear Teeth Counts and Ratios

Gear

Gear Teeth Count

1st Drive

13

1st Driven

44

2nd Drive

25

2nd Driven

44

3rd Drive

39

3rd Driven

46

4th Drive

47

4th Driven

42

5th Drive

54

5th Driven

38

Reverse Drive

25

Reverse Idler

21

1st & 2nd Gear Synchronizer Sleeve

49

Output Shaft

20

Ring Gear

89

Blocking Ring Clearances

Measure

Standard

Service Limit

Metric

English

Metric

English

1st and 2nd Gears

1.2-1.4 mm (min.)

0.047-0.055 in (min.)

0.8 mm (min.)

0.032 in (min.)

3rd, 4th, and Reverse Gears

0.9-1.2 mm (min.)

0.035-0.047 in (min.)

0.5 mm (min.)

0.020 in (min.)

5th Gear

0.7-1.1 mm (min.)

0.028-0.043 in (min.)

0.5 mm (min.)

0.020 in (min.)

Axial Play Specifications

Measurement

Specification

Metric

English

Between 2nd and 3rd Drive Gears

0.05-0.40 mm

0.002-0.016 in

Between 4th Drive Gear and Input Shaft Bearing

0.05-0.40 mm

0.002-0.016 in

Between Reverse Gear and Reverse Gear Washer

0.10-0.20 mm

0.004-0.008 in

Input Shaft Axial Play

0.09-0.15 mm

0.004-0.006 in

Output Shaft Axial Play

This is a calculated value. It can change based upon age of case and output shaft bearing. Refer to Transmission Assemble .