Gears and Shafts Cleaning and Inspection: Countershaft

WARNING: This page is about a different variant/trim than selected.

Fig 1: Inspecting 1st, 2nd & Reverse Gear Axial Clearance

Courtesy of GENERAL MOTORS CORP.

Inspect 1st (2), 2nd (3), and reverse gear (1) for axial clearance. Lift up on the gear from the settled position and measure travel. Refer to Transmission Clearance Specifications , Gear Axial Clearance table.

Fig 2: Measuring Radial Clearance For 5th Countershaft Gear

Courtesy of GENERAL MOTORS CORP.

Measure the radial clearance for 5th countershaft gear.
1. Place the 5th countershaft gear, with the needle roller bearing, on the countershaft journal.
2. Use J 8001-3 or J 26900-12 (1) and J 26900-13 (2). See Special Tools .
3. Position J 8001-3 or J 26900-12 on the gear. See Special Tools .
4. Move the gear up and down.
  Specification:
  - Standard Clearance: 0.015-0.068 mm (0.0006-0.0027 in)
  - Maximum Clearance: 0.160 mm (0.0063 in)
If the clearance exceeds the maximum, replace the gear, the roller bearing, or the countershaft.

Fig 3: Inspecting Rear Bearing Race On Countershaft

Courtesy of GENERAL MOTORS CORP.

Clean the countershaft in a suitable solvent and air dry all the parts.
Inspect the rear bearing race (1) on the countershaft for the following conditions:
- Brinelling
- Wear
- Scoring
Inspect the 5th countershaft gear bearing race (2) for the following conditions:
- Brinelling
- Wear
- Scoring

Fig 4: Measuring Outer Diameter Of Countershaft Journal

Courtesy of GENERAL MOTORS CORP.

Using a micrometer, measure the outer diameter of the countershaft journal.
Specification: Minimum diameter: 29.860 mm (1.1756 in)
Inspect all of the countershaft gears for being faulty following the gear inspection steps.
Replace the countershaft if it is faulty.