Application:

Engine
Type

Engine
RPO

Trans
RPO

Gear

Engine
Mode
(4,
V6, V8)

Transmission
Input
Speed
(rpm)

Cadillac

CTS

6
CYL. NA

LGX

M5N

8

V6

1100-1500

Cadillac

CTS

4 CYL.
Turbo

LTG

M5N

8

4

Cadillac

CTS-V

8 CYL.
Supercharged

LT4

M5U

8

Cadillac

ATS

4
CYL. NA

LCV

M5T

Cadillac

ATS

6
CYL. NA

LGX

Cadillac

ATS

4 CYL.
Turbo

Cadillac

ATS-V

Cadillac

Vehicle
Speed
mph
(km/h)

Bulletin No.: 18-NA-355
Chevrolet/
GMC

Chevrolet/
GMC/
Cadillac

Silverado/
Sierra

May, 2019

Page 3

8 CYL.
NA BAS

L8B

M5X

8

V8

1050-1500

45-55
(72-88)

200-375

26

Denali/
Denali
XL/
Escalade/
ESV

8
CYL. NA

L86

M5U

8

V8

1050-1500

45-55
(72-88)

200-375

26

Colorado/
Canyon

6
CYL. NA

LGZ

M5T

8

V6

1100–
1500

42–55
(67-88)

150–250

25

Silverado/
Sierra/
Yukon

Chevrolet/
GMC

GDS Test

PicoScope Test

Important: Confirmation of TCC shudder should be
completed using GDS or a PicoScope.
To confirm TCC shudder, the vibration concern must be
created in normal operation (Mode A) of the test. If the
concern is gone with the TCC disabled (Mode B, TCC
Open) and is gone with TCC enabled (Mode C, TCC
Locked), then the vibration root cause is TCC shudder,
and the fluid flush procedure corrective action
described below should be performed.
If the concern is not present in Mode A, then the
vibration concern is NOT TCC shudder.
If the concern is still present with the TCC disabled
(Mode B) or with the TCC enabled (Mode C, TCC slip
speed at zero), then the vibration root cause is NOT
TCC shudder.
GDS can be used to monitor TCC slip to confirm TCC
shudder. Once TCC shudder is duplicated, TCC slip
speed should be monitored while driving at a steady
speed and steady throttle. TCC shudder typically will
present itself in an erratic saw tooth or oscilloscope
pattern where TCC slip will increase and decrease
rapidly. The increase may be as much as a 100 rpm
and decline to near 0 rpm, creating a saw tooth type
pattern. When TCC slip speed is graphed on the GDS
screen, desirable slip speed would present itself with 5
to 40 rpm variation. Slip speed will vary by application.
Some performance models will have slip speed in the
range of 0 to 10 RPM while some passenger cars and
light duty trucks may have 20–30 rpm of slip. The slip
speed should be consistent and not erratic, presented
in a saw tooth or oscilloscope pattern.
Vibrations not identified as TCC shudder should be
further investigated using the Vehicle Vibration
Diagnosis in SI as a starting point.

The PicoScope (CH-51450) essential tool and NVH
software or GDS must be used to confirm TCC
shudder, engine, tire or driveline component related
conditions.

4629472

To confirm TCC shudder, record the PicoScope data
while driving in 8th gear in the application specific
condition above. Minimize extraneous vibration input by
testing on a smooth road and correct any other known
vehicle vibration issues (tires, brakes, etc.) before
conducting test. If TCC shudder is present, a vibration
peak will appear (highlighted by arrow below) within
+/-2 Hz of the frequency listed in the table above. TCC
shudder vibration frequency is stationary in 8th gear. If
the vibration frequency follows vehicle speed or engine
speed, then it is NOT TCC shudder.
In the above illustration, frequency and default view
have been selected.

Page 4

May, 2019

Bulletin No.: 18-NA-355

Important: Obtain a single page screen print from
GDS or PicoScope that shows the TCC shudder event.
This screen print must be attached to the Repair Order
hard copy for reference. A screen print can be
completed by pressing the Print Screen button on your
laptop computer or by using a program or application
such as Snipping Tool.
Examples of acceptable screen prints:

5336317

•
•

GDS2 Session showing TCC slip
GDS2 Special Functions showing TCC Locked
Slip Speed

Bulletin No.: 18-NA-355

May, 2019

Page 5

5336322

•

PicoScope screen print showing TCC shudder
(vibration frequency) in the graphic above.

•

Special Tools
DT-52263 Transmission Fluid Exchange Kit:
• DT-52263-1 Block Assembly (includes fluid drain
hose, spring clamp)
• DT-52263-2 Cooler Line Plug (qty 3) (use with rear
differential cooler and Camaro V8 non rear
differential cooler)
• DT-52263-3 ½” Cooler Line Flush Adapter for
2019 Silverado and Sierra

•

DT-52263-4 3/8” Hose Adapter (6” long with 2
hose clamps)
DT-52263-5 Radiator Cooler Drain Adapter

3763203

•

DT-51190 Transmission Oil Fill Adapter

Page 6

May, 2019

Bulletin No.: 18-NA-355

Service Procedure
Initial TransFlow Flush Machine Setup
Important: The prepping procedure only needs to be
completed if the DT-45096 supply reservoir has
DEXRON VI fluid in it and has not been converted to
use the new blue label Mobil 1 Synthetic LV ATF HP
fluid.
Note: The prepping procedure only needs to be
completed if HP fluid is not in the supply reservoir.
1. Connect the TransFlow adapter DT-45096-31 to
the supply line of the DT-45096 TransFlow
machine.

5181938

•

GE-47716-2 Graduated Bucket
5180884

1215917

DT-45096 TransFlow Cooler Flush Machine

4733125

DT-45096-31 TransFlow Adapter (one of two pieces
from DT-45096-30)

2. Switch the DT-45096 TransFlow to Idle.
3. Connect power leads to the vehicle 12-volt DC
supply.
4. Turn the TransFlow main switch ON.
5. Connect air supply to the DT-45096.
6. Place the TransFlow supply hose with adapter
DT-45096-31 into a waste reservoir using care not
to spill the expelled fluid.
7. Switch the DT-45096 TransFlow to Flow and allow
all the fluid in the supply reservoir to be removed
and placed in the waste reservoir.
8. Switch the control switch back to idle.

Bulletin No.: 18-NA-355

May, 2019

Page 7

Fluid Exchange Procedure - Colorado, Canyon,
Silverado, Sierra, Yukon Denali and Escalade
Models with an Accessible Transmission Oil
Cooler Line Block Assembly
Important: This procedure must be followed as
published. The exchange process is required to obtain
proper level of new blue label Mobil 1 Synthetic LV ATF
HP fluid. Intermixing of other types of transmission fluid
or aftermarket additive packages will result in a low
concentration level of new fluid and will not provide
satisfactory results.
1. Fill the DT-45096 with 20 quarts of HP fluid.
2. Raise the vehicle on a hoist.

5182541

3. Install the DT-45096-31 TransFlow adapter (1) to
the DT-51190 fluid fill adapter (2).

5180563

4. Remove the transmission oil cooler pipe assembly
from the transmission.
5. Install the DT-52263-1 Adapter Block Assembly
(1), reusing the seal from the transmission oil
cooler pipe assembly.
6. Tighten the bolt (2) to 22 Y (16 lb ft).
7. Place the hose (3) in the GE-47716-2 Graduated
Measuring Bucket, utilizing a Spring Clamp to
retain the hose.

Page 8

May, 2019

Bulletin No.: 18-NA-355

13. Shut the engine off immediately.
14. Connect the DT-45096 to the vehicle battery
12 volts and connect shop air to the air connection.

3723844

8. Remove the level set plug (1) from the
transmission.
Important: DO NOT over tighten the DT-51190 as it
can be damaged by excessive torque. DO NOT exceed
9 Y (80 lb in).
9. Install the DT-51190/DT-45096-31 assembly and
hand tighten as shown in the graphic above.

5181027

15. Switch the DT-45096 TransFlow to Flow and add
4 quarts of HP to the transmission.

5181020

3723839

10. Connect the TransFlow fluid feed (supply) line (3)
to the DT-45096-31 adapter (2).
11. Lower the vehicle.
Caution: DO NOT REMOVE MORE THAN 3 QUARTS
OF FLUID AS IT COULD CAUSE FLUID PUMP
CAVITATION AND POSSIBLY DAMAGE THE
TRANSMISSION.
12. Utilizing the graduated bucket, start the engine and
run 30- 45 seconds until 3 quarts of fluid is
expelled.

16. Switch the DT-45096 TransFlow to Idle (Reducing
fluid level in the TransFlow from 20–16).
17. Switch the TransFlow DT-45096 to Flow and start
the engine:
17.1. Add a maximum of 4 quarts of HP Fluid to
the transmission, turn the TransFlow switch
to idle once 4 quarts have been added, while
allowing 4 additional quarts of oil to fill the
DT-graduated bucket (Reducing fluid level in
the TransFlow from 16 – 12).

Bulletin No.: 18-NA-355

May, 2019

Note: DO NOT add additional transmission fluid until
the 4 quarts of oil have been removed from the
transmission (Reducing fluid level in the TransFlow
from 12–8).

Page 9

24. If equipped, remove the Thermal By-Pass Block
from the cooler pipes on the Escalade, Silverado,
Sierra and Yukon Models.

17.2. Repeat step 17.1.
17.3. Add a maximum of 5 quarts of HP fluid to the
transmission while allowing 5 additional
quarts of oil to fill the DT-graduated bucket
(Reducing fluid level in the TransFlow from
8 – 3).

1762577

25. Install DT-45096-31 adapters (1) to the
transmission oil cooler lines.
26. Connect the DT-45096 TransFlow to the
DT-45096-31 adapters.

5181401

18.
19.
20.
21.
22.

17.4. Shut the engine off once 16 quarts of fluid
have been collected.
17.5. Properly dispose of the expelled
transmission fluid.
Raise the vehicle.
Disconnect the DT-45096 TransFlow feed (supply)
line from DT-45096-31 TransFlow adapter.
Using care, remove DT-45096-31/DT-51190 as an
assembly.
Remove the DT-51190 fluid fill adapter from
DT-45096-31 hose.
Install the level set plug.

Tighten
Tighten the plug to 9 Y (80 lb in).
23. Remove DT-52263-1 Adapter Block Assembly
from the transmission.

5210461

27. Switch the DT-45096 TransFlow to Flush.
28. Flush the vehicle cooler and lines using 2 quarts of
HP fluid.
⇒ Flush 1 quart of fluid through the lines, then
switch the hose connections and flush 1 quart
of fluid in the opposite direction.
29. Remove the DT-51190/DT-45096-31 assembly.
30. If equipped, install the Thermal By-Pass Block from
the cooler pipes on the Escalade, Silverado, Sierra
and Yukon Models.

Page 10

May, 2019

31. Install the transmission oil cooler pipe using a new
cooler block seal.
32. Partially lower the vehicle.
33. Start the engine.
34. Using care, shift the transmission through all
forward ranges and Reverse.
35. Shift the transmission into Park.
36. Perform the Transmission Fluid Level and
Condition Check outlined below in this procedure:
36.1. Get the transmission fluid temperature to the
proper temperature.
36.2. Install the level set plug.

Tighten
Tighten the plug to 9 Y (80 lb in).
The TCC shudder condition should be directional
improved immediately after the fluid exchange
procedure. It may take up to 320 km (200 mi) for the
TCC shudder condition to be eliminated. It is not a
requirement for the dealer to drive the vehicle 320 km
(200 mi). The customer should be advised that the full
effect will take up to 320 km (200 mi) and a minimum of
two cold to operating temperature drive cycles.

Bulletin No.: 18-NA-355

Fluid Exchange Procedure - Camaro (Except
Camaro V8-See Procedure below for Camaro
V8), CTS and ATS Not Equipped with a Rear
Differential Cooler
Important: This procedure must be followed as