Technical Service Bulletin (TSB)
8HP75 D Clutch Repair
REFERENCE:

TSB: 21-029-25 REV. A
GROUP: 21 - Transmission and Transfer
Case

Date:

July 4, 2025

VEHICLES
AFFECTED:

2020 - 2023 (DT) RAM 1500 Pickup
2022 - 2023 (WS) Wagoneer / Grand Wagoneer
This bulletin applies to vehicles equipped with an 8-Spd Auto 8HP75
Trans (Buy-US) (Sales Code DFR).

REVISION: 21-029-25

MARKET APPLICABILITY:
NA

MEA

SA

IAP

EE

CH

NOTE: **This bulletin applies
to North and South
America, Enlarged
Europe, Middle East
& Africa, India &
Asia Pacific and China
markets.**
CUSTOMER
SYMPTOM:

Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must have
at least 11,265 km (7,000 mi.) and exhibit/set one or more of the following Diagnostic Trouble Codes
(DTCs):
● P0733-00 - Gear 3 Shift Incorrect Ratio.
● P1DA8-00 - Incorrect Gear Ratio Clutch A B or D Defective.
● P1D92-00 - Incorrect Gear Ratio - Clutch 4 Defective.
Customers may also comment on the following:
● Vehicle enter limp home mode.

CAUSE:

D Clutch repair

This bulletin supersedes Technical Service Bulletin (TSB) 21-029-25, date of issue April 03, 2025,
which should be removed from your files. All revisions are highlighted with **asterisks** and include
a new Market Applicability note, an updated Special Tool reference number, updated Repair Procedure
graphic call outs, and a new Repair Procedure note.
REPAIR SUMMARY:
This bulletin involves replacing the D clutch.

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CLAIMS DATA:

Labor Operation No:
21-00-64-96

21-00-64-95
Failure Code

Labor Description
D Clutch - Inspect and
Replace DT
(3 - Highly Skilled)
D Clutch - Replace WS
(3 - Highly Skilled)
ZZ

Skill Category
2 - Transmission and
Transfer Case

Labor Time
5.5 Hrs.

2 - Transmission and
Transfer Case
Service Action

5.4 Hrs.

Skill Category
2 - Transmission and
Transfer Case
2 - Transmission and
Transfer Case
2 - Transmission and
Transfer Case
2 - Transmission and
Transfer Case
2 - Transmission and
Transfer Case

Labor Time
0.4 Hrs.

RELATED LOPS:

Labor Operation No:
21-00-64-60
21-00-64-60
21-00-64-66
21-00-62-66
21-00-00-51

Labor Description
Skid Plate - DT
(3 - Highly Skilled)
Skid Plate - WS
(3 - Highly Skilled)
4x4/AWD Equipped - DT
(3 - Highly Skilled)
4x4/AWD Equipped - WS
(3 - Highly Skilled)
Adaptation Procedure
DT/WS
(2 - Skilled)

0.4 Hrs.
0.6 Hrs.
1.0 Hrs.
1.0 Hrs.

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J21 FSAR-TSB-5852

SPARE PARTS:

Qty
1 (AR)

Part No.
68723676AA

Description
Shaft Kit, Output

Notes
D Clutch Repair Kit (DT,
WS AWD GMET6)
D Clutch Repair Kit (DT,
WS AWD V8 Hemi)
D Clutch Repair Kit (DT,
WS, RWD)

1 (AR)

68722049AA

Shaft Kit, Output

1 (AR)

68723677AA

Shaft Kit, Output

10 (AR)

68218925AB

18 (AR)

68153921AA

4 (AR)

68049954AC

3 (AR)

68089195AA

16

06506497AA

Fluid, Automatic
Transmission, Quart
Mopar Antifreeze/Coolant
10 Year/150,000 Mile
Formula OAT (Organic
Additive Technology)
Lubricant, Transfer Case, Transfer Case BW 48-11
Quart
Lubricant, Transfer Case, Transfer Case BW 48-12
Quart
Bolt, Hex Flange Head
Locking, Driveshaft to
Front Axle

DIAGNOSIS:
If the customer describes the symptom/condition above, perform the repair procedure.
SPECIAL TOOLS/EQUIPMENT:

Description
Guide Sleeve
Press Fixture
Bearing/Gear
Rings, Support
Installer, Seal

Ref. No.
10377
**8925A**
1130
10378
9677

Notes

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REPAIR PROCEDURE:
CAUTION!
The Transmission Control Module (TCM), or Transmission Control Module Assembly (TCMA) is
extremely sensitive to Electrostatic Discharge (ESD). Always use a ground strap and follow the ESD
guidelines in Electrostatic Discharge Sensitive Devices. Failure to follow these instructions may result
in damage to the TCM/TCMA.
CAUTION!
If the transmission is being reconditioned (clutch/seal replacement) or replaced, it is necessary
to perform the TCM Adaptation Procedure. Refer to the detailed service procedures available in
DealerCONNECT/Service Library under: Service Info>08 - Electrical/8E - Electronic Control Modules/
Module, Transmission Control/ Module Programming.
NOTE: Tag all clutch pack assemblies as they are removed for reassembly identification.

Fig. 1
Fluid Note
1. Are DTCs P0733, P1DA8 or P1D92 present and the vehicle have at least 1,265 km (7,000 mi.)?
● YES >>> Proceed to Step 2.
● NO >>> The bulletin does not apply.

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J21 FSAR-TSB-5852

2. Remove the torque converter Fig. 2#GUID-893FC0A2-B93A-4280-B407-18FF7640B9C9 .

Fig. 2
Torque Converter
1 - Torque Converter

3. If equipped with 4WD, remove the transmission housing extension bolts and remove the extension housing
Fig. 3.

Fig. 3
Extension Housing
1 - Extension Housing Bolts
2 - Extension Housing

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4. Remove the transmission output shaft seal Fig. 4.

Fig. 4
Transmission Output Shaft Seal
1 - Transmission Output Shaft Seal

5. Remove the output shaft snap ring Fig. 5.
NOTE: For 4X4 only.

Fig. 5
Output Shaft Snap Ring
1 - Output Shaft Snap Ring

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J21 FSAR-TSB-5852

6. Remove the output shaft flange locknut staking Fig. 6.
NOTE: 2WD only.

Fig. 6
Output Shaft
1 - Output Shaft Flange Locknut Staking
2 - Output Shaft Flange
3 - Output Shaft Flange

7. Using a flange holder, remove the output shaft flange nut.
8. Remove the output shaft flange and inspect the output shaft flange sealing surface for damage, replace as
needed.
9. Remove the 13 transmission oil pan bolts Fig. 7.
NOTE: Inspect the gasket for reuse. If the seal is cut or torn, replace the gasket.

Fig. 7
Transmission Oil Pan
1 - Transmission Oil Pan Bolts
2 - Transmission Oil Pan

10. Carefully remove the transmission oil pan and gasket.

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11. If equipped, disconnect the Hydraulic Impulse Oil Storage (H.I.S.) connector Fig. 8.

Fig. 8
Hydraulic Impulse Oil Storage
1 - Hydraulic Impulse Oil Storage (H.I.S) Connector
2 - Hydraulic Impulse Oil Storage (H.I.S) Bolts

12. If equipped, remove bolts and the H.I.S accumulator.
13. Remove the valve body assembly end retainer bolts Fig. 9.

Fig. 9
Valve Body Assembly
1 - Valve Body Assembly End Retainer Bolt
2 - Valve Body Assembly End Retainer Bolt
3 - Electrical Connector Lock

14. Lift the electrical connector lock to release the internal harness end from inside the transmission for valve
body assembly removal.

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J21 FSAR-TSB-5852

15. Remove the Output Speed Sensor (OSS) bolt and gently lift the OSS out from the case Fig. 10.

Fig. 10
Output Speed Sensor
1 - Output Speed Sensor Bolt

16. Using Guide Sleeve 10377, carefully pull the electrical harness insulator straight out from the transmission
case Fig. 11.

Fig. 11
Electrical Harness Insulator
1 - Remover/Installer, Guide Sleeve 10377
2 - Electrical Harness Insulator

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17. Remove the valve body assembly bolts in the order shown and remove the valve body Fig. 12.

Fig. 12
Valve Body Assembly
18. Remove the fluid port from the transmission or valve body assembly (the fluid port may stick in the valve
body upon removal) Fig. 13.

Fig. 13
Fluid Port
1 - Fluid Port

19. Remove the fluid transfer tube and O-rings.

-1120. Remove the input shaft O-ring using a small pick or equivalent Fig. 14.

Fig. 14
Input Shaft O-Ring
1 - Input Shaft O-ring

21. Remove and DISCARD the 14 oil pump housing bolts Fig. 15.
NOTE: Remove the input shaft O-ring before the oil pump is removed.

Fig. 15
Oil Pump Housing
1 - Oil Pump Housing Bolts

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22. Carefully pry the oil pump housing away from the case using a small flat blade screwdriver or equivalent
through the case opening Fig. 16.

Fig. 16
Oil Pump Housing Pry Point
1 - Oil Pump Housing Pry Point

23. Remove the oil pump housing from the transmission.
24. Remove the B clutch spring damper Fig. 17.

Fig. 17
B Clutch Assembly
1 - B Clutch Spring Damper

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J21 FSAR-TSB-5852

25. Remove the park pawl lock rod guide plate bolts and remove the plate Fig. 18.
NOTE: The transmission must be in a vertical position before the main stack is removed, so
damage to the drums does not occur.

Fig. 18
Pawl Lock Rod
1 - Pawl Lock Rod Guide Plate Bolts
2 - Pawl Lock Rod Guide Plate

26. Remove the input/output shaft and P4 annulus drum assembly from the case Fig. 19.

Fig. 19
P4 Annulus Drum Assembly
1 - P4 Annulus Drum Assembly

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