1 - Oil Pump Housing Bolts

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. From the front of the transmission, remove the oil pump housing.

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24. Remove the B clutch spring damper Fig. 17.

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

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

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J21 FSAR-TSB-5851

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

27. Position the input/output shaft and P4 annulus drum assembly on a press fixture Fig. 20.

Fig. 20
Input/Output Shaft And P4 Annulus Drum Assembly
1 - Input/Output Shaft And P4 Annulus Drum Assembly
2 - B Clutch Pack
**3 - Assembly, Press Fixture 8925A**
4 - Splitter, Bearing/Gear 1130

28. Remove the B clutch pack.

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29. Remove the P1 annulus/B clutch hub assembly from the P4 annulus drum Fig. 21.

Fig. 21
P1 Annulus/B Clutch Hub Assembly
1 - P1 Annulus/B Clutch Hub Assembly

30. Remove the thrust bearing and holding plate from the P1 planetary carrier.
NOTE: The are three pieces intended to be used in multiple locations around the drum to prevent
damage from prying Fig. 22.

Fig. 22
Rings Support
1 - Rings Support

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J21 FSAR-TSB-5851

31. Position the rings support on the P4 annulus drum assembly to protect the drum Fig. 23.
NOTE: Pry the snap ring from the opposite side of the snap ring openings to release.
NOTE: When the snap ring is removed the internal clutch drum may drop slightly.

Fig. 23
Snap Ring
1 - Snap Ring
2 - Snap Ring Openings

32. Using a suitable tool release the snap ring by prying in and up from the opposite side of the snap ring
openings.
33. Remove the P1 planetary carrier.
34. Remove the input shaft with P2 planetary carrier from the drum assembly Fig. 24.

Fig. 24
Input Shaft
1 - Input Shaft With P2 Planetary Carrier
2 - Thrust Bearing And Washer

35. Remove the thrust bearing and washer.

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36. Remove the P2 annulus/P3 sun gear from the drum assembly Fig. 25.

Fig. 25
P4 Annulus Drum
1 - P2 Annulus/P3 Sun Gear
2 - D Clutch Drum
3 - P4 Annulus Drum

37. Remove the D clutch drum from the P4 annulus drum.
NOTE: The are three pieces intended to be used in multiple locations around the drum to prevent
damage from prying.
38. Remove the P4 planetary carrier/output shaft lock ring from the P4 annulus drum by gently prying the
locking tabs open and turning the lock ring to center the locating tabs in the output shaft tab openings.
Discard the lock ring and install a NEW lock ring during assembly Fig. 26.
NOTE: Heavy duty park system only.

Fig. 26
P4 Planetary Carrier
1 - P4 Planetary Carrier/Output Shaft Lock Ring Locking Tabs

CAUTION!
A unique transmission fluid has been developed for this transmission. This fluid is NOT compatible
with ATF+4 or any other current FCA US LLC transmission fluid. For specifics about this unique
fluid see FLUIDS, LUBRICANTS AND GENUINE PARTS.

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J21 FSAR-TSB-5851

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.
NOTE: 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.
39. Install a NEW P4 planetary carrier/output shaft assembly into the P4 annulus drum and install park gear if
one was removed from old assembly.
40. Install the NEW P4 planetary carrier/output shaft lock ring from the P4 annulus drum by turning the lock
ring to center the lock ring tabs in the output shaft tab openings and gently staking the locking tabs closed
Fig. 27.

Fig. 27
P4 Planetary Carrier
1 - P4 Planetary Carrier/Output Shaft Lock Ring Locking Tabs

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41. Install the D clutch drum into the P4 annulus drum Fig. 28.

Fig. 28
P4 Annulus Drum
1 - P2 Annulus/P3 Sun Gear
2 - D Clutch Drum
3 - P4 Annulus Drum

42. Install the P2 annulus/P3 sun gear in the drum assembly Fig. 29.

Fig. 29
Input Shaft
1 - Input Shaft With P2 Planetary Carrier
2 - Thrust Bearing And Washer

43. Install the thrust bearing and washer.

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J21 FSAR-TSB-5851

44. Install the input shaft with P2 planetary carrier into the drum assembly Fig. 30.

Fig. 30
Input Shaft
1 - Input Shaft
2 - P2 Planetary Carrier

45. Install the snap ring in the orientation shown (snap ring will only install one way) with the locating tabs Fig.
31.

Fig. 31
Snap Ring
1 - Snap Ring
2 - Snap Ring Openings

46. Install the thrust bearing and holding plate onto the P1 planetary carrier.
47. Install the selectable shim to the P1 annulus/B clutch hub.

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48. Install the P1 annulus\B clutch hub assembly onto the P4 annulus drum Fig. 32.

Fig. 32
P1 Annulus/B Clutch Hub Assembly
1 - P1 Annulus/B Clutch Hub

49. The B clutch, dependent on transmission Julian Date, may contain wave springs that sit around each fiber.
There will be five friction plates (discs), five wave springs, five steel plates, one cover plate, one snap ring,
and one wave plate (last plate far left in figure) Fig. 33.

Fig. 33
Plates
1 - Cover Plate
2 - Friction Plates
3 - Wave Springs
4 - Steel Plates
5 - Wave Plate

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J21 FSAR-TSB-5851

50. Install the B clutch discs and plates Fig. 34.

Fig. 34
Input/Output Shaft And P4 Annulus Drum Assembly
1 - Input/Output Shaft And P4 Annulus Drum Assembly
2 - B Clutch Pack
**3 - Assembly, Press Fixture 8925A**
4 - Splitter, Bearing/Gear 1130

51. Install the snap ring.
NOTE: The transmission must be in a vertical position when installing the main stack, so damage
to the drums does not occur.
52. Install the input/output shaft and P4 annulus drum assembly into the case Fig. 35.

Fig. 35
P4 Annulus Drum Assembly
1 - P4 Annulus Drum Assembly

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53. Install the park pawl lock rod onto the fork Fig. 36.

Fig. 36
Pawl Lock Rod
1 - Pawl Lock Rod Guide Plate Bolts
2 - Pawl Lock Rod Guide Plate

54. Position the park pawl lock rod guide plate, install the three park pawl lock rod guide plate retaining bolts.
Tighten the bolts to 10 N-m (89 In. Lbs.).
55. Install the B clutch damper spring on the assembly Fig. 37.

Fig. 37
B Clutch
1 - B Clutch Spring Damper

56. Carefully position the oil pump housing assembly into the case.

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J21 FSAR-TSB-5851

57. Install the NEW input shaft O-ring Fig. 38.
NOTE: Firmly press the oil pump in place before drawing it in with bolts.

Fig. 38
Input Shaft O-Ring
1 - Input Shaft O-Ring

58. Install the NEW oil pump cover retaining bolts and tighten the bolts as follows:Install the transmission oil
pump assembly and secure using 14 NEW pump housing bolts Fig. 39.
a. In order to seat the oil pump cover properly, pre tighten bolts one, seven and nine to 6 N·m (53 in. lb.).
b. Working in a clockwise pattern, beginning with number one, tighten to 10 N·m (89 in. lb.).
c. Working in a clockwise pattern, beginning with number one, tighten an additional 90°.

Fig. 39
Oil Pump Housing
1 - Oil Pump Housing Cover And Bolts

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59. Temporarily install the MPR lever to release tension on the shift fork as follows Fig. 40:
a. Install the MPR lever 180 degrees offset from its original position.
b. Install the MPR retaining nut and hand tighten.
c. Turn the MPR lever and using a tie strap, secure the lever into position so the park release fork is in the
same position as it was before valve body assembly removal.

Fig. 40
Manual Park Release
1 - MPR Lever Retaining Nut
2 - MPR Lever
3 - Tie Strap

60. Install NEW fluid transfer tube O-rings and install the fluid transfer tube to the transmission case Fig. 41.

Fig. 41
Fluid Port
1 - Fluid Tube

61. Install the valve body assembly alignment pins in the transmission case as guides for the valve body
assembly.
NOTE: Make sure the shift fork lines up properly.
62. Using the valve body assembly alignment pins position the valve body assembly to the transmission.
NOTE: After several bolts have been hand tightened, remove the guide pins.

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J21 FSAR-TSB-5851

63. Install the valve body assembly bolts Fig. 42. Tighten the bolts to 8 N-m (71 In. Lbs.).

Fig. 42
Valve Body Assembly
64. Using Guide Sleeve 10377, carefully install the electrical harness guide sleeve into the transmission case
Fig. 43.

Fig. 43
Electrical Harness Insulator
1 - Remover/Installer, Guide Sleeve 10377
2 - Electrical Harness Insulator

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65. Latch the electrical connector lock by pushing down Fig. 44.

Fig. 44
Valve Body Assembly
1 - Valve Body Assembly End Retainer Bolt
2 - Valve Body Assembly End Retainer Bolt
3 - Electrical Connector Lock

66. Install the valve body assembly end bolt and electrical connector lock bolt. Tighten the valve body end bolt
to 8 N-m (71 In. Lbs.).
67. When installing the OSS into the case, take care to position the OSS guide pin Fig. 45 or damage to the
sensor may result Fig. 46.

Fig. 45
Correct Output Speed Sensor Pin Alignment

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J21 FSAR-TSB-5851

Fig. 46
Incorrect OSS Pin Alignment
68. If equipped, install the HIS and bolts Fig. 48. Tighten the HIS bolts to 8 N-m (71 In. Lbs.).

Fig. 47
Hydraulic Impulse Oil Storage
1 - Hydraulic Impulse Oil Storage (HIS) Connector
2 - Hydraulic Impulse Oil Storage (HIS) Bolts

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69. Install the OSS and tighten the OSS bolt to 8 N-m (71 In. Lbs.) Fig. 47.

Fig. 48
Output Speed Sensor
1 - Output Speed Sensor Bolt

70. Connect the HIS wire harness connector.
71. Remove the tie strap and return the MPR lever to its original position Fig. 49.

Fig. 49
Manual Park Release
1 - MPR Lever
2 - MPR Lever Retaining Nut

72. Install the MPR lever nut and tighten to 12 N-m (9 Ft. Lbs.).

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J21 FSAR-TSB-5851

73. Position the transmission oil pan and gasket Fig. 50.

Fig. 50
Transmission Oil Pan Assembly
1 - Transmission Oil Pan Bolts
2 - Transmission Oil Pan

74. Install the 13 transmission oil pan bolts and tighten to 10 N-m (89 In. Lbs) Fig. 50.
NOTE: For 4X4 only.
CAUTION!
The seal must be installed flush with the case. Driving the seal deeper could damage the seal
causing a leak.
75. Position the NEW output shaft seal over the output shaft and against the transmission case Fig. 51.

Fig. 51
Transmission Output Shaft Seal Installed
1 - Transmission Output Shaft Seal

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76. Using Seal Installer 9677, install the output shaft seal Fig. 52.

Fig. 52
Output Shaft Installed
1 - Seal Installer
2 - Output Shaft Seal

77. For 4X4 ONLY if equipped, position the extension housing and install the extension housing bolts Fig. 53
to 27 N-m (20 Ft. Lbs.).

Fig. 53
Extension Housing
1 - Extension Housing Bolts
2 - Extension Housing

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J21 FSAR-TSB-5851

78. For 2WD vehicles, remove and DISCARD the seal from the output flange and replace it with a NEW seal
Fig. 54.

Fig. 54
Output Flange And O-Ring
1 - Output Flange
2 - O-Ring

79. For 2WD vehicles, install the output shaft flange Fig. 55 using a NEW output flange nut and washer. Use
a 34 mm, 12 point socket end to hold the flange during installation.
CAUTION!
The nut must be staked to prevent vibration from backing the nut out or loose.

Fig. 55
Transmission Output Flange
1 - Transmission Output Flange
2 - Transmission Output Flange Nut
3 - Transmission Output Flange Nut Stake

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80. Install the torque converter Fig. 56 Refer to the detailed service procedures available in DealerCONNECT/
Service Library under: Service Info> 21 - Transmission and Transfer Case/Automatic/Torque Converter/
Installation.

Fig. 56
Torque Converter
1 - Torque Converter

81. For WL 4x4 only, install the O-ring/seal to the output shaft Fig. 57.
NOTE: Seal color can vary for this O-ring/seal.

Fig. 57
WL Output Shaft Seal
1 - WL Output Shaft Seal

82. Before installing the transmission in the vehicle, pre-fill the transmission as outlined in Fill Transmission
After Service. Refer to the detailed service procedures available in DealerCONNECT/Service Library
under: Service Info>21 - Transmission and Transfer Case/Automatic/Standard Procedure.
83. Install the transmission. Refer to the detailed service procedures available in DealerCONNECT/Service
Library under: Service Info>21 - Transmission and Transfer Case / Automatic - 8HP50/850RE / Installation.

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J21 FSAR-TSB-5851

84. Use wiTECH to complete Quick Learn Procedure and clear any DTCs.
NOTE: **For SA market only, after applying this TSB, it is not necessary to send DID-I or DID-A.**
POLICY:
Reimbursable within the provisions of the warranty.
This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of FCA US LLC.