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 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 5

Go to Step 4

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 6

Go to Step 7

Replace the worn, damaged or missing components. Refer to the appropriate procedure(s).

Did you complete the replacement?

Go to Step 22

--

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 10

Go to Step 8

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

Were you able to duplicate the vibration?

Go to Step 9

Go to Vibration Diagnostic Aids

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

Is the vibration still present?

Go to Diagnostic Starting Point - Transfer Case

Go to Diagnostic Starting Point - Rear Differential Carrier

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

Go to Step 11

Go to Step 15

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 12

Go to Step 13

1. Replace the transfer case output flange. Refer to Drive Pinion Flange/Yoke and/or Oil Seal Replacement .
2. Perform the Vibration in Service-Stall Test (Non-Torque Sensitive) .

Is the vibration still present?

Go to Step 13

Go to Step 22

1. Inspect the engine strut 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 engine strut mounts as necessary. Refer to the following:

•	Engine Mount Strut Replacement - Left Side for the 3.5L engine.

•	Engine Mount Strut Replacement - Right Side for the 3.5L engine.

•	Engine Mount Strut Replacement - Left Side for the 3.6L engine.

•	Engine Mount Strut Replacement - Right Side for the 3.6L engine.

3. Inspect the transfer case-to-engine lower brace for looseness or damage.
4. Tighten or replace the transfer case lower brace as necessary. Refer to Support Brace Replacement .

Did you find and correct a condition?

Go to Step 14

Go to Step 15

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

Is the vibration still present?

Go to Step 15

Go to Step 22

Measure the runout of the torque tube input flange. Refer to Torque Tube Input Flange Runout Measurement .

Does the runout measurement require that the torque tube input flange be replaced?

Go to Step 16

Go to Step 17

1. Replace the torque tube assembly. Refer to Driveline Torque Tube Replacement .
2. Perform the Vibration in Service-Stall Test (Non-Torque Sensitive) .

Was the vibration reduced or eliminated?

Go to Step 22

Go to Step 17

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

Was the vibration reduced or eliminated?

Go to Step 22

Go to Step 18

Determine the runout of the rear axle differential pinion input shaft. Refer to the Differential Pinion Input Shaft Runout Measurement .

Does the runout measurement require that the pinion input shaft be replaced?

Go to Step 19

Go to Step 20

Replace the rear axle differential pinion assembly. Refer to Drive Pinion Housing and/or Seal Replacement .

Did you complete the replacement?

Go to Step 22

--

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

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Mark the position of the propeller shaft on both the transfer case output shaft flange and the torque tube 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 22

Go to Step 21

Return the propeller shaft to its original position and balance the propeller shaft. Refer to Driveline System Balance Adjustment .

Were you able to balance the driveline system?

Go to Step 22

Go to Vibration Diagnostic Aids

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