19NA164

Bulletin No.:
Service Bulletin
Date:
19-NA-164
March, 2020
TECHNICAL
Subject:
Launch Shudder/Booming Noise Between 40-50 MPH (64-80 KM/H)
Attention: This bulletin only applies to certain models with a wheelbase of 419cm (165 in) 2-piece
driveshaft only. A visual inspection of the drive shaft must be performed as the RPO
doesn’t differentiate between a 2-piece or 3-piece driveshaft. This bulletin Does Not
apply to 3-piece driveshafts.
Model Year:
Brand:
Model:
Chevrolet
Silverado (MD)
4500HD/
5500HD/
6500HD
VIN:
from
to
2019
2019
from
to
Engine:
Transmission:
Involved Region or Country
North America, Middle East and Israel
Condition
Some customers may comment that a booming noise can be heard between 40-50 mph (64-80
km/h).
Cause
This condition may be caused by the front propeller (prop) shaft.
Copyright 2020 General Motors LLC. All Rights Reserved.
Page 2
March, 2020
Bulletin No.: 19-NA-164
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
If a booming noise has been verified to be caused by the 2 piece prop shaft, perform the
following Service Procedure.
Bulletin No.: 19-NA-164
March, 2020
Service Procedure
1. Raise the vehicle. Refer to Lifting and Jacking the
Vehicle in SI.
Page 3
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).
Page 4
March, 2020
Bulletin No.: 19-NA-164
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.
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.
5374766
Bulletin No.: 19-NA-164
March, 2020
Page 5
Parts Information
Causal
Part
Description
N/A
N/A
N/A
Part
Number
Qty
NUT, CENTER
BEARING
19405513
1
WASHER,
COMPANION
FLANGE NUT
19405514
1
KIT, "U" JOINT
STRAPS AND
BOLTS
19404513
2
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
3
Modified
Released August 14, 2019
Revised September 30, 2019 – Removed CV515 from the Attention section.
Revised March 03, 2020 - Added 2 piece drive shaft information to the Attention and
Correction sections.
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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