Has the Vibration Analysis - Road Testing table been completed?

Go to Step 2

Go to Vibration Analysis - Road Testing

Did you record frequency data from the J 38792-A , Electronic Vibration Analyzer (EVA) 2, during the Vibration Analysis - Road Testing procedure?

Go to Step 3

Go to Step 4

Based on the Vibration Analysis - Road Testing table, is the concern first order or sixth order driveline related?

Go to Step 6

Go to Step 4

Based on the Vibration Analysis - Road Testing table, is the concern second order driveline related?

Go to Step 21

Go to Step 5

Based on the Vibration Analysis - Road Testing table, is the concern a noise that is not felt?

Go to Vibration Diagnostic Aids

Go to Vibration Analysis - Road Testing

Inspect the following components for wear and/or damage:

Are any of the components listed worn or damaged?

Go to Step 7

Go to Step 8

Replace the worn, damaged or missing components. Refer to the appropriate procedures.

Did you complete the replacement?

Go to Step 27

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Attempt to duplicate the vibration in the stall. Refer to Vibration in Service-Stall Test (Non-Torque Sensitive)

Were you able to duplicate the vibration?

Go to Step 11

Go to Step 9

Perform the Vibration in Service-Stall Test (Torque Sensitive) .

Were you able to duplicate the vibration?

Go to Step 10

Go to Vibration Diagnostic Aids

1. Remove the propeller shaft. Refer to Propeller Shaft Replacement in Propeller Shaft.
2. Perform the Vibration in Service-Stall Test (Torque Sensitive) .

Is the vibration still present?

Go to Diagnostic Starting Point - Transfer Case in Transfer Case - NVG 900

Go to Diagnostic Starting Point - Rear Drive Axle in Rear Drive Axle

Was the vibration most evident under the rear of the transfer case?

Go to Step 12

Go to Step 16

Measure the runout of the transfer case output flange. Refer to Transfer Case Output Flange Runout Measurement .

Does the runout measurement require that the transfer case output flange be replaced?

Go to Step 13

Go to Step 14

1. Replace the transfer case output flange. Refer to the Transfer Case - NVG 900 information in the Transmission/Transaxle/Transfer Case Unit Repair Manual.
2. Perform the Vibration in Service-Stall Test (Non-Torque Sensitive) .

Is the vibration still present?

Go to Step 14

Go to Step 27

1. Inspect the powertrain mounts for the following:

•	Loose and/or missing fasteners

•	Improper alignment

•	Cracked, dry-rotted, and/or oil-soaked insulators

•	Twisted, broken, torn, and/or collapsed insulators

•	Bent, twisted, and/or deformed brackets

2. Replace the powertrain mounts as necessary. Refer to the following procedures as necessary:

•	Engine Front Mount Replacement in Engine Mechanical - 3.4L

•	Engine Mount Replacement - Right Side in Engine Mechanical - 3.4L

•	Transmission Rear Mount Replacement in Automatic Transaxle - AF33-5

•	Transmission Mount Replacement - Left Side in Automatic Transaxle - AF33-5

3. Inspect the transfer case-to-engine mounting bracket for looseness or damage.
4. Tighten or replace the transfer case mounting bracket as necessary. Refer to Transfer Case Bracket Replacement in Transfer Case - NVG 900.

Did you find and correct a condition?

Go to Step 15

Go to Step 16

Perform the Vibration in Service-Stall Test (Non-Torque Sensitive) .

Is the vibration still present?

Go to Step 16

Go to Step 27

Inspect the condition of the rear drive module (RDM) input flange for the following conditions:

Did the inspection indicate the RDM input flange requires repair or replacement?

Go to Step 17

Go to Step 18

1. Repair or replace the pinion flange. Refer to Drive Pinion Flange/Yoke and/or Oil Seal Replacement in Rear Drive Axle.
2. Perform the Vibration in Service-Stall Test (Non-Torque Sensitive) .

Was the vibration reduced or eliminated?

Go to Step 27

Go to Step 18

1. Replace the propeller shaft. Refer to Propeller Shaft Replacement in Propeller Shaft.
2. Perform the Vibration in Service-Stall Test (Non-Torque Sensitive) .

Was the vibration reduced or eliminated?

Go to Step 27

Go to Step 19

Re-index the propeller shaft. Perform the following steps:

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Mark the position of the propeller shaft on both the transfer case output shaft flange and the RDM input flange.
3. Remove the propeller shaft.
4. Rotate the propeller shaft 180 degrees to both of the flanges.
5. Reinstall the propeller shaft.
6. Attempt to duplicate the vibration in the stall. Refer to the Vibration in Service-Stall Test (Non-Torque Sensitive) .

Was the vibration reduced or eliminated?

Go to Step 27

Go to Step 20

Return the propeller shaft to it's original position and balance the propeller shaft. Refer to Driveline System Balance Adjustment .

Were you able to balance the driveline system?

Go to Step 27

Go to Vibration Diagnostic Aids

Inspect the following components for wear or damage:

Are any of the components listed worn or damaged?

Go to Step 22

Go to Step 23

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

Did you complete the replacement?

Go to Step 27

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Measure the propeller shaft angles. Refer to Driveline Working Angles Measurement .

Do the propeller shaft angles require adjustment?

Go to Step 24

Go to Step 25

Adjust the propeller shaft angles. Refer to Driveline Working Angles Adjustment .

Did you complete the repair?

Go to Step 27

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Inspect the propeller shafts for proper phasing. Refer to Propeller Shaft Phasing Inspection .

Does the propeller shaft phasing require correction?

Go to Step 26

Go to Vibration Diagnostic Aids

Correct the propeller shaft phasing. Refer to Propeller Shaft Phasing Correction .

Did you complete the repair?

Go to Step 27

--

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 3

System OK