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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Manual Transmission - NV 3500 - Service) >> Diagnostic Information and Procedures >> Transmission Jumps Out of Gear >> Test Description

Test Description

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

The numbers below refer to step numbers on diagnostic table.

  1. 2:  A static shift test is performed by shifting into all gear positions with engine not operating. While performing test, slowly move shift lever. Feel for proper movement of shift lever and transmission internal shift components.
  2. 4:  A dynamic shift test is performed by shifting into all gear positions with engine operating. Test for correct mesh of synchronizers sleeve and speed gear selector teeth. Move shift lever, and feel for synchronizer sleeve to release form gear, and then let up on clutch pedal. Depress clutch pedal and move shift lever to re-engage gear, to ensure full travel of shift components.
  3. 5:  This step inspects for worn or damaged transmission or engine mounts. Loose mounts may cause a shock on transmission allowing for gear disengagement.
  4. 6:  This step inspects for misalignment of clutch to transmission. Misalignment may put a bind on input shaft, allowing for input shaft or mainshaft to tip.
  5. 8:  This step inspects pilot bearing and pilot bearing journal on input shaft. A worn pilot bearing or input shaft may allow input shaft to tip, causing gear disengagement.
Transmission Jumps Out of Gear

Step Action Yes No
DEFINITION: Gear disengagement occurs during acceleration or deceleration.
1 Did you review the Symptoms - Manual Transmission, and perform the necessary inspections? Go to Step 2  Go to Symptoms - Manual Transmission 
2
  1. Perform a static shift test.
  2. Test for the following:
    • Blockage preventing full shift lever movement
    • Excessive movement in the shift lever
    • Detent plungers engaging in the shift rails
    • Synchronizer pressure pieces on the synchronizer sleeves
Did the transmission shift completely into all gears?
Go to Step 4  Go to Step 3 
3 Remove the shift tower and inspect for worn or faulty components. Refer to Shift Lever Assembly Replacement .
Did you find and repair the condition?
Go to Step 10  Go to Step 4 
4
  1. Perform a dynamic shift test on the transmission.
  2. Test for the following:
    • Synchronizer sleeve engagement to the speed gear selector teeth
    • Detent plungers engaging in the shift rails
Did the transmission shift completely into all gears?
Go to Step 5  Go to Step 8 
5 Inspect the engine and/or transmission mounts. Refer to Transmission Mount Replacement - Rear .
Did you find and repair the condition?
Go to Step 10  Go to Step 6 
6 Inspect the clutch housing for loose bolts or misalignment.
Are there any loose bolts or misalignment?
Go to Step 7  Go to Step 8 
7
  1. Align the housing, if required.
  2. Tighten any loose housing bolts. Refer to Transmission Replacement .
Did you find and repair the condition?
Go to Step 10  Go to Step 8 
8
  1. Remove the transmission. Refer to Transmission Replacement .
  2. Remove the clutch assembly. Refer to Clutch Assembly Replacement .
  3. Inspect the pilot bearing for being faulty.
  4. Inspect the input shaft for excessive wear at the pilot bearing.
Did you find and repair the condition?
Go to Step 10  Go to Step 9 
9
  1. Disassemble the transmission. Refer to TRANSMISSION DISASSEMBLE .
  2. Inspect the following components for wear or damage:
    • The shift rails
    • The detent plungers and springs
    • The shift forks
    • The synchronizer sleeve and speed gear selector teeth
    • The mainshaft to input shaft bearing and journals
    • The speed gear bearings and journals
    • The speed gear axial clearance
    • The mainshaft center and rear bearings
Did you find and repair the condition?
Go to Step 10  Go to Diagnostic Aids 
10 Operate the system in order to verify the repair.
Did you correct the condition?
System OK Go to Step 1