IK1400005 - Driveline Vibration Troubleshooting Procedure

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IK1400005

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5

Major System : REAR AXLE

Created:

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Title: Driveline Vibration Troubleshooting Procedure
Applies To: All Vehicles

DESCRIPTION
Driveline Vibration Troubleshooting procedure

SYMPTOMS
Vibration



PARTS INFORMATION
Part #

Description

Qty.

Dana Spicer # 11139.194

Protractor Attachment

1

TROUBLESHOOTING
1. Check and record air ride height setting. If the air ride is not adjusted properly then readjust to the proper specifications and road test to determine if problem has now
been fixed. Refer to IK0300028 and IK0300004.
2. If available; Set up EVA II (electronic vibration analyzer tool), this tool will assist you in confirming that the vibration is a prop_vibration. Obviously if you were to see the
predominate vibration as a E_ or T_ vibration then you would look either at the engine or tires. Document your findings in case they are needed later in the repair. (See
IK0300008-Vibration Troubleshooting).
3. Inspect driveline for damage such as dents or missing weights. Inspect u-joints and yokes for excessive play. It is important to do this prior to re-lubing the joints. Insure
the u-joint bearing cups are properly seated in the yokes and that the caps are not spinning.
4. Check the runout of all driveshafts. These measurements should be taken in three locations on each shaft (3” from each end of and center of the tube). InterAxle shafts
can be measured in the center only. For accurate measurements, the paint should be removed first. Mark the “high” spots at each location on the tube. The ends should
be less than 0.020”, ideally below 0.010” and the center should be less than 0.025”, ideally below 0.015”. If the measurements exceed the limits at either end, the u-joint
at the end of the shaft with the high measurement should be removed from the yoke and reinstalled in the yoke after rotating either the yoke or the shaft 180 degrees.
Remeasure the runouts and note the location of the high spots. If the runout is still excessive, check to see if the high spot moved on the shaft approximately 180 degrees
or if it stayed in the same spot. Moving of the high spot indicates the yoke is out of round, not the shaft. Although you may have a driveline shop rebalance and/or
straighten a shaft, if a vibration remains, it is important to again document the runout and verify it is below the previously mentioned “ideal” limits. (See IK06000006 Driveline Vibration Diagnostic Checklist for a printable check list)
5. If inspecting the amount of movement in the spline section of the driveshaft, the dial or digital indicator base must be installed on one side of the splines (on the prop
shaft), and the needle on the other side of the splines. If the dial indicator base is mounted on a solid surface, erroneous measurements will result. This measurement
should read less than 0.015". If a defect is found, both the male and female sides of the slip joint must be returned for review.
6. If the problem still exists then you will need to obtain driveline angle measurements. The forms are provided below, choose the

worksheet applicable to your chassis configuration and fill out the form. Open a case file and attach the form, be sure to include the
following information:





Make sure you list the specific and current ride height. If you do not list the specific number, it is going to be the first thing we ask for.
Take photos of each measurement you have recorded. Start with the digital clinometer zeroed on the frame, and each measurement
from there. This will speed up the process, especially if the truck angles do not match the way the truck was built. Be sure the arrow
and angle can be clearly seen in the photo.
If possible, supply the part numbers of the currently installed axle seats. Again, this will speed up the process if parts need to be
changed. Get the p/n from seat that is physically installed in the truck. (Do not disassemble the suspension to get the numbers unless
instructed to do so in the case file)

Helpful hints for accurate driveline and angle measuring:






To properly check your digital clinometer, use a two foot level on a workbench; level the level then set protractor on level and press zero, then turn your protractor around
180 degrees to face away from you and recheck to make sure it still reads zero. The two readings should be within 0.1 degrees of each other. This is test is performed to
check the accuracy of the digital clinometer.
Once you have tested the accuracy of the tool, place the digital clinometer on the frame rail and zero it. This is done so you always have the same reference. If you zero
the protractor at any other location, you would need to verify the frame angle is the same as the original recorded angle before any adjustments could be made.
Take all readings from the same surface of the digital clinometer and keep it pointed in the same direction for every measurement. The example photos show this clearly.

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IK1400005 - Driveline Vibration Troubleshooting Procedure

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The orientation of the writing (do not turn the tool upside down from when you started), and the same end of the digital clinometer always facing the front of the vehicle.






Double check transmission angle measurement which can be obtained from the u-joint cap on the output yoke, engine valve cover, oil pan bolts and sometimes a flat
surface on the head of the engine as well as transmission pan or valve body.
Be very diligent to get a good reading off the rear end housing-there is a tool (attachment to the protractor & available from Dana Spicer #11139.194) that can be used on
trans and rear end yokes for accurate measurements which when the yoke is turned to straight up and down the tool reads the flat of the u-joint bearing cup. The surface
of the cup needs to be properly cleaned to insure you get an accurate measurement. An alternative to the available tool is to use a socket on the u-joint cap. The caps will
not all be vertical when the unit is pulled into the work bay. Removing the wheel checks and rolling the truck forward or backwards until the u-joint is vertical is the most
acceptable method to obtain an accurate reading.

Due to the short tube length of drive shafts between the rear drive axles, it is highly recommended to use the v-block that comes with the
RoadRanger driveline angle analyzer kit to keep the digital clinometer from contacting the welds at the end of the tube.

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IK1400005 - Driveline Vibration Troubleshooting Procedure

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OTHER RESOURCES
Driveline Angle Worksheets
4x2

6x4

4x4 / 6x6

4x2 / 6x4 with Aux Section

1 Piece Driveline

1 Piece Main Driveline

4x4

2 Piece Driveline with 2 Axles

2 Piece Driveline

2 Piece Main Driveline

4x4 with 2 Piece Rear Driveline

3 Piece Driveline with 2 axles

3 Piece Driveline

3 Piece Main Driveline

6x6

4 Piece Driveline

4 Piece Main Driveline

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