For 1990-2009 cars

### Test Description

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

1. First-order driveline vibrations can be caused by excessive runout of the propeller shaft.

Step | Action | Yes | No
--- | --- | --- | ---
1 | Has the Vibration Analysis - Road Testing table been completed? | Go to Step 2 | Go to Vibration Analysis - Road Testing
2 | Inspect the following components for wear or damage:

• | Inspect the propeller shafts for dents, damage, missing weights, and undercoating.

• | Inspect the U-joints for damage and missing components.

• | Inspect the center bearings for damaged rubber components, worn bearings, or a cracked bracket.

Are any of the components listed worn or damaged?

Go to Step 3

Go to Step 4

3 | Replace the damaged or missing components. Refer to one of the following procedures in Propeller Shaft:

• | One-Piece Propeller Shaft Replacement

• | Two-Piece Propeller Shaft Replacement

• | Three-Piece Propeller Shaft Replacement

• | Four-Piece Propeller Shaft Replacement

• | Tandem Axle Propeller Shaft Replacement

• | Universal Joint Replacement

• | Propeller Shaft Center Support Bearing Replacement

Did you complete the replacement?

Go to Step 14

--

4 | Measure the runout at the front of the forward-most rear axle propeller shaft. Refer to Propeller Shaft Runout Measurement . Does the runout measurement require that the propeller shafts be replaced? | Go to Step 6 | Go to Step 5
5 |

1. Replace the transmission mount. Refer to Transmission Mount/Support Replacement in Manual Transmission - Medium Duty.
2. Attempt to duplicate the customer's concern

Is the vibration still present?

Go to Step 6

Go to Step 14

6 | Measure the runout of the complete propeller shafts. Refer to Propeller Shaft Runout Measurement . Does the runout measurement require that the propeller shaft(s) be replaced? | Go to Step 7 | Go to Step 8
7 |

1. Replace the propeller shaft. Refer to appropriate procedure in Propeller Shaft:

• | One-Piece Propeller Shaft Replacement

• | Two-Piece Propeller Shaft Replacement

• | Three-Piece Propeller Shaft Replacement

• | Four-Piece Propeller Shaft Replacement

• | Tandem Axle Propeller Shaft Replacement

2. Attempt to duplicate the customer's concern.

Was the vibration reduced or eliminated?

Go to Step 14

Go to Step 8

8 | Inspect the following components for wear or damage:

• | Inspect the propeller shafts for dents, damage, missing weights, and undercoating.

• | Inspect the U-joints for damage and missing components.

• | Inspect the center bearings for damaged rubber components, worn bearings, or a cracked bracket.

Are any of the components listed worn or damaged?

Go to Step 9

Go to Step 10

9 | Replace the damaged or missing components. Refer to oneof the following procedures in Propeller Shaft:

• | One-Piece Propeller Shaft Replacement

• | Two-Piece Propeller Shaft Replacement

• | Three-Piece Propeller Shaft Replacement

• | Four-Piece Propeller Shaft Replacement

• | Tandem Axle Propeller Shaft Replacement

• | Universal Joint Replacement

• | Propeller Shaft Center Support Bearing Replacement

Did you complete the replacement?

Go to Step 14

--

10 |

1. Measure the vehicle trim height. Refer to Trim Height Inspection in Suspension General Diagnosis.
2. Adjust the vehicle trim height, if necessary.

Did you find and correct a condition?

Go to Step 11

Go to Step 12

11 | Attempt to duplicate the customer's concern. Was the vibration reduced or eliminated? | Go to Step 14 | Go to Step 12
12 | Measure the propeller shaft angles. Refer to Driveline Working Angles Measurement . Do the propeller shaft angles require adjustment? | Go to Step 13 | Go to Vibration Diagnostic Aids
13 | Adjust the propeller shaft angles. Refer to Driveline Working Angles Adjustment . Did you complete the repair? | Go to Step 14 | --
14 |

1. Install or connect any components that were removed or disconnected during diagnosis.
2. Perform the Vibration Analysis - Road Testing table. Refer to Vibration Analysis - Road Testing .

Is the vibration still present?

Go to Step 2

System OK