Manual Transmission
Inspection and Verification
NOTICE: If transmission noise is reported, first check the transmission fluid level. The vehicle should not be driven if the transmission fluid level is low. A low transmission fluid level will damage the transmission.
NOTE: If an observed or reported concern is found, correct the cause before proceeding.
Gear driven units produce a certain level of noise. Some noise is acceptable and audible at certain speeds or under various driving conditions. Many conditions, such as road and weather can amplify normal vehicle noise.
The following overview is a guide to diagnose a transmission or clutch concern:
Verify and document the customer concern.
During the customer interview, if a leak was noticed or if a leak is the concern, check the transmission fluid level. The vehicle should not be driven if the transmission fluid level is low.
Check fluid level and condition. Evaluate the clutch hydraulic system. Evaluate the clutch. Inspect gearshift mechanism. Evaluate the transmission.
Check Fluid Level and Condition
An incorrect transmission fluid level may affect the transmission operation and can result in transmission damage. REFER to: Transmission Fluid Level Check (308-03A Manual Transmission - 6-Speed Manual Transmission - MT82, General Procedures).
Check Fluid Level and Condition
NOTICE: Excessive temperatures may break down the transmission lubricant. If there is reason to believe the transmission has been subjected to temperatures exceeding 135°C (275°F) for an extended period (greater than 20 minutes), change the lubricant immediately.
A low transmission fluid level can result in poor transmission shifting, engagement or damage. It also indicates a leak in the transmission seals or gaskets.
1. Check the transmission fluid condition. Allow the transmission fluid to drip onto a white cloth and examine the stain. Check the transmission fluid for contamination or metal particles.
Evaluate Clutch Hydraulic System
1. Verify the clutch hydraulic fluid reservoir is filled to the correct level. If the clutch hydraulic fluid level is low, add fluid as necessary. Check the clutch hydraulic system for leaks.
Evaluate the Clutch
1. Apply and release the clutch pedal slowly to check pedal binding. Make sure the clutch pedal can be fully applied and is not restricted by the floor mat.
2. With the engine idling and the park brake applied, move the gearshift lever into 4th gear. Increase engine speed to 2,000 rpm and slowly release the clutch pedal. If the engine stalls, the clutch is not slipping. If the engine does not stall, the clutch is slipping.
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.