GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2001 🢒 Firebird 🢒 Transmission/Transaxle 🢒 Manual Transmission - M49 🢒 Transmission Noisy

Diagnostic Aids

The manual transmission can be noisy for a number of reason, from being noisy in neutral, low, high and reverse gear. Diagnosis the transmission from the level of fluid to the right type of fluid in the transmission. If the transmission is in neutral and engaged and makes whirring kind of a noise and is heard outside the vehicle, this a normal condition for this type of manual transmission. The transmission could also be noisy internally from the gears, synchronizers, and the bearings. They should be inspected for worn or damaged parts.

Test Description

The number(s) below refer to the step number(s) on the diagnostic tables.

  1. This step is testing for the correct fluid level.

    2.

  2. This step is inspecting for the correct transmission fluid.

    3.

  3. This step is inspecting for internal damage or worn parts.

Step

Action

Yes

No

DEFINITION: The transmission is noisy and the noise may carry into the passenger compartment.

1

Did you review the manual transmission symptom operations and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Manual Transmission

2

Test the transmission fluid level.

Is the fluid level correct?

Go to Step 4

Go to Step 3

3

Add transmission fluid. Refer to Transmission Fluid Level Inspection .

Did you find and repair the condition?

System OK

Go to Step 4

4

Inspect the transmission for the correct fluid type.

Is the transmission the correct type?

Go to Step 6

Go to Step 5

5

Drain and refill the transmission with the correct type fluid. Refer to Transmission Oil Drain and Fill .

Did you find and repair the condition?

System OK

Go to Step 6

6

Inspect the shift control closeout boot.

Is the closeout boot loose or damaged?

Go to Step 7

Go to Step 8

7

Position and tighten the closeout boot to specification, or replace the boot as necessary. Refer to Shift Control Shift Closeout Boot Replacement .

Did you find and repair the condition?

System OK

Go to Step 8

8

Inspect the clutch housing for loose bolts and/or misalignment with the engine.

Is there any loose bolts or misalignment with the engine?

Go to Step 9

Go to Step 10

9

Tighten the clutch housing bolts to specifications. Refer to Clutch Housing Replacement .

Did you find and repair the condition?

System OK

Go to Step 10

10

  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble and inspect the following transmission components:
    3. • Gear shift components for wear or damage
    • Transmission gears for wear or damage
    • Bearings for wear or damage

Is there any wear or damage?

Go to Step 11

--

11
  1. Replace worn or damaged components as necessary.

    2. Refer to Transmission/Transaxle/Transfer Case Unit Repair Manual.

  2. Install the transmission. Refer to Transmission Replacement .

Did you find and repair the condition?

Go to Step 12

Go to Diagnostic Aids

12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1