Initial Inspection and Diagnostic Overview

The following items must be checked before proceeding:
1. Know and understand the customer's concern.
2. Perform a road test to validate customer's concern. (When does it exist?)
a. upshift
b. downshift
c. coasting
d. engagement
e. If noise/vibration, check for the following dependencies:
- rpm dependent
- vehicle speed dependent
- shift dependent
- gear dependent
- range dependent
- temperature dependent
3. Is vehicle at normal operating temperature?
4. Check fluid level and condition.
5. Visually inspect the vehicle for the following items:
- vehicle modifications
- electronic add-on items
- leaks
- proper linkage adjustments
6. Check TSBs for concern information.

7. NOTE: Gear rollover noise, inherent in manual transmissions, (caused by the constant mesh gears turning at engine idle speed while the clutch is engaged and the transmission is in NEUTRAL) and clutch release hub and bearing noise are sometimes mistaken for mainshaft bearing noise. Noise caused by a worn or damaged clutch release hub and bearing will be loudest when the clutch is held disengaged. Gear rollover noise will disappear when the clutch is disengaged or when the transmission is engaged in gear. In the event that a transmission bearing is damaged, the noise is more pronounced while engaged in gear under load or coast conditions than in NEUTRAL. When concerns of this nature are encountered, it will be necessary to road test the vehicle to determine if bearing noise exists. Under no circumstances should any transmission rework be attempted to eliminate gear rollover noise or clutch release hub and bearing noise.

Refer to the Symptom Chart.