Bulletin No.:

Service Bulletin

Date:

19-NA-164
August, 2019

TECHNICAL
Subject:

Booming Noise Between 40-50 MPH (64-80 KPH)

Attention: This bulletin only applies to certain CV515 models with a wheelbase of 419cm (165 in).
Brand:

Model:

Chevrolet

Silverado
(MD)
4500HD/
5500HD/
6500HD

Model Year:

VIN:

from

to

2019

2019

from

to

Engine:

Transmission:

Involved Region or Country

North America

Condition

Some customers may comment that a booming noise can be heard between 40-50 mph
(64-80 kph).
This condition may be caused by the front propeller (prop) shaft.

Cause

5374809

– The front prop shaft from the transmission to the center support bearing is phased from
the factory at 32 degrees as shown in graphic A.
– An adjustment is needed to change the phase angle from 32 degrees to 52 degrees as
shown in graphic B.
Correction

Copyright 2019 General Motors LLC. All Rights Reserved.

If a booming noise has been verified to be caused by the prop shaft, perform the following
Service Procedure.

Page 2

August, 2019

Service Procedure
1. Raise the vehicle. Refer to Lifting and Jacking the
Vehicle in SI.

Bulletin No.: 19-NA-164

8. Utilizing a mallet, tap the bearing cup assembly to
separate the rear shaft from the front shaft rear
axle yoke allowing the prop shaft to rest on the
straps.
9. Using care, position the driveshaft aside or with the
aid or an assistant, remove the propshaft from the
vehicle.

5374240

2. With a paint marker, located at the center support
bearing (1), mark the front prop shaft rear yoke (2)
to the rear drive shaft (3) front u-joint as shown
above (A).

5374303

10. Remove the mid-ship nut and washer from front
prop shaft yoke (1) and discard.
11. with a paint marker, mark the yoke to the prop
shaft (2) as shown above.
12. Utilizing a puller, follow the tool manufacturer's
instructions to remove the yoke.

5374271

3. Attach support straps (1) to frame rails or other
structural part of the truck.
4. With a paint marker, mark the rear u-joint to the
rear axle yoke (2).
5. Remove the universal joint bolts and straps at the
rear axle yoke and discard.
6. Utilizing a mallet (3), tap the bearing cup assembly
to separate the shaft from the rear differential axle
yoke allowing the prop shaft to rest on the straps.
7. Remove the universal joint bolts and straps at the
front prop shaft rear yoke and discard.

5374294

13. After the yoke is removed from the prop shaft,
rotate the yoke counter-clockwise by two teeth
from its original position to increase the phase
angle from 32 degrees to 52 degrees (A).

Bulletin No.: 19-NA-164

August, 2019

Page 3

Important: Bearing cups must be fully seated between
the yoke nibs. Failure to seat the cups properly will
result in a premature failure.
19. Align the bearing cups with the yoke ears making
sure that the cups are evenly spaced between the
nibs of the yoke.
⇒ Utilizing a mallet, seat the bearing cups into
the yoke.
20. Install the new half round straps and lock bolts.

5374725

Note: It may be required to add a socket (2) onto the
u-joint for a flat surface to mount the protractor (1).
14. Using a digital protractor or equivalent, verify the
new phase angle by installing the protractor onto
the transmission end yoke and zero it out.
15. When the protractor is at zero degrees, move the
protractor to the rear yoke of the front prop shaft
and record the degrees (3).
⇒ If required, remove and rotate the yoke until it
reaches 52 degrees respectively.

4826872

21. Torque the strap bolts in a counter-clockwise
direction as shown in the graphic above.
⇒ Torque strap bolts to 55 ft lbs (75 NM).
22. Grease the U-joint and slip member after driveshaft
installation.
23. Lower the vehicle.

Parts Information
Causal
Part

Description

N/A
N/A

N/A
5374766

16. Once the desired angle has been reached, install
the mid-ship washer (1) and nut (2).
⇒ Torque nut to 500 ft lbs (678 NM).
17. Inspect the yoke and mating surfaces for burrs,
damage, rust, contamination and grease.
18. With safety straps in place, align the phasing
marks between the front prop shaft rear yoke and
the rear prop shaft front u-joint.

Part
Number

Qty

NUT, CENTER
BEARING

19405513

1

WASHER,
COMPANION
FLANGE NUT

19405514

1

KIT, "U" JOINT
STRAPS AND
BOLTS

19404513

2

Page 4

August, 2019

Bulletin No.: 19-NA-164

Warranty Information
For vehicles repaired under the Powertrain coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
Labor Operation

Description

Labor Time

3087078*

Front Axle Rear Flange Indexing

0.7 hrs

*This is a unique Labor Operation for Bulletin use only.

Version

1

Modified

Released August 14, 2019

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

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