For 1990-2009 cars

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step inspects for vibration causing a noise. If the vehicle is equipped with an aftermarket box or is carrying a certain load, the driveline axle may not be correct, and could cause a vibration. The vibration maybe resonating into the transmission, causing a noise.

2. This step inspects for the correct transmission fluid level. If the transmission fluid level is excessively low, damage may have occurred to the transmission components.

3. This step inspects for the correct type of transmission fluid. The transmission uses a special fluid. If the incorrect fluid was used, there may have been an overheating condition. Overheating may cause damage to the transmission components.

4. This step inspects for noise coming into the driver compartment. Improper sealing of the shift tower may be allowing normal transmission noise to be heard by the driver.

5. This step tests to determine if clutch components are making the noise. Depress the clutch pedal slowly and listen for the change in noise. If the noise changes while pressing the pedal, the transmission component is faulty. If the noise does not change until the clutch is completely disengaged, it may be a faulty clutch component.

Step | Action | Yes | No
--- | --- | --- | ---
DEFINITION: The transmission is making a noise. The different noises may be a whine or a growl caused by faulty bearings or gears. The noise may also be caused by a faulty component, causing a vibration noise or rattle.
1 | Did you review the Symptoms - Manual Transmission and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Manual Transmission
2 | Is the noise present at a certain road speed or with a certain load? | Go to Step 3 | Go to Step 4
3 | Inspect for the correct driveline angle. Refer to Driveline Working Angles Measurement. Did you find and repair the condition? | Go to Step 19 | Go to Step 4
4 | Is the noise present in all gears? | Go to Step 6 | Go to Step 5
5 | Is the noise present in just one gear? | Go to Step 18 | Go to Step 6
6 | Inspect the transmission fluid level. Is the fluid level correct? | Go to Step 8 | Go to Step 7
7 | Add transmission fluid. Refer to Transmission Fluid Replacement . Did you find and repair the condition? | Go to Step 19 | Go to Step 8
8 | Inspect the transmission for the correct fluid type. Refer to Lubrication Specifications . Is the transmission fluid the correct type? | Go to Step 10 | Go to Step 9
9 | Drain and fill the transmission with the correct type fluid. Refer to Transmission Fluid Replacement . Did you find and repair the condition? | Go to Step 19 | Go to Step 10
10 | Inspect the shift tower boot. Is the closeout boot loose or damaged? | Go to Step 11 | Go to Step 12
11 | Position and tighten the shift tower boot to specifications. Refer to Control Lever and/or Boot Replacement . Did you find and repair the condition? | Go to Step 19 | Go to Step 12
12 | Is the vehicle equipped with a transfer case? | Go to Step 13 | Go to Step 14
13 | Engage the transfer case in the different modes. Is the noise still present or the same? | Go to Step 14 | Go to Symptoms - Transfer Case
14 |

1. Inspect for engine to transmission alignment.
2. Inspect for loose transmission mounting bolts.

Are there any loose transmission mounting bolts?

Go to Step 15

Go to Step 16

15 | Replace and tighten the transmission mounting bolts. Refer to Transmission Mount Replacement . Is the noise still present? | Go to Step 16 | Go to Step 19
16 | With the engine operating, depress the clutch pedal. Is the noise still present? | Go to Step 17 | Go to Step 18
17 |

1. Remove the clutch. Refer to Clutch Assembly Replacement.
2. Inspect the following components for being the cause of the noise:

• | The release bearing

• | The pilot bearing

• | The pressure plate

• | The clutch disc

• | The engine crankshaft end play

Did you find and repair the condition?

Go to Step 19

Go to Step 18

18 |

1. Remove the transmission. Refer to Transmission Replacement .
2. Disassemble the transmission. Refer to Transmission Disassemble. Use the information in the Cleaning and Inspection section to determine if any of the transmission components are faulty.

Did you find and repair the condition?

Go to Step 19

--

19 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 1