Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

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

5: 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.
7: This step inspects for the correct type of transmission fluid. The transmission uses DEXRON® III fluid. If the incorrect fluid was used, there may have been an overheating condition. Overheating may cause damage to the transmission components.
9: 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.
13: 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, it may be a faulty clutch component. If the noise does not change until the clutch is completely disengaged, the transmission component is faulty.

Transmission Noisy

Step	Action	Yes	No
DEFINITION: The transmission is making a noise. The noise may be a whine or a growl caused by faulty bearings or gears. The noise may also be caused from a faulty component causing a vibration noise.
1	Did you review the Symptoms - Manual Transmission operations and perform the necessary inspections?	Go to Step 2	Go to Symptoms - Manual Transmission
2	Is the noise present while in neutral, with the engine operating?	Go to Diagnostic Aids	Go to Step 3
3	Is the noise present in all gears?	Go to Step 5	Go to Step 4
4	Is the noise present in just one gear?	Go to Step 15	Go to Step 5
5	Inspect the transmission fluid level. Is the fluid level correct?	Go to Step 7	Go to Step 6
6	Add transmission fluid. Refer to Transmission Fluid Replacement . Did you find and repair the condition?	Go to Step 16	Go to Step 7
7	Inspect the transmission for the correct fluid type. Refer to Lubrication Specifications . Is the transmission fluid the correct type?	Go to Step 9	Go to Step 8
8	Drain and fill the transmission with the correct type of fluid. Refer to Transmission Fluid Replacement . Did you find and repair the condition?	Go to Step 16	Go to Step 9
9	Inspect the shift tower boot. Is the closeout boot loose or damaged?	Go to Step 10	Go to Step 11
10	Position and tighten the shift tower boot to specifications. Refer to Shift Control Boot Replacement . Did you find and repair the condition?	Go to Step 16	Go to Step 11
11	Inspect for torque tube to transmission alignment and loose transmission mounting bolts. Are there any loose transmission mounting bolts?	Go to Step 12	Go to Step 15
12	Replace and tighten the transmission mounting bolts. Refer to Fastener Tightening Specifications . Is the noise still present?	Go to Step 13	Go to Step 16
13	With the engine operating, depress the clutch pedal. Is the noise still present?	Go to Step 14	Go to Step 15
14	Remove the clutch. Refer to Clutch Assembly Replacement in Clutch. Inspect the following components for being the cause of the noise: The release bearing The pilot bearing The dual mass flywheel, if equipped The pressure plate The clutch disc The input shaft bearing The engine crankshaft end play Did you find and repair the condition?	Go to Step 16	Go to Step 15
15	Remove the transmission. Refer to Transmission Replacement . Disassemble the transmission. Refer to Transmission Disassemble (Y Car) Transmission Disassemble (CTSV) Transmission Disassemble (GTO) in the Transmission Unit Repair Manual. 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 16	-
16	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 1