8HP75 - Assembly

WARNING: This page is about a different car, the 2024 Jeep Grand Cherokee L. However, it is still accessible from the selected car via links, so may be relevant.

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.

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 MODULE, TRANSMISSION CONTROL (TCM), MODULE PROGRAMMING .

ASSEMBLY

Insert the P4 annulus) into the P4 annulus drum.
Install the snap ring into the P4 annulus drum.

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1 - Snap Ring

2 - P4 Annulus
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.

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1 - P4 Planetary Carrier/Output Shaft Lock Ring
Position the bearings on the top and the bottom of Clutch C.

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1 - Clutch C
Install Clutch C into the P4 sun gear/Clutch C/E retainer.
Install the needle bearing onto the hub of the Clutch E.

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1 - Snap Ring

2 - Clutch E
Install the Clutch E into the P4 sun gear/Clutch C/E retainer.
Install the snap ring into the P4 sun gear/Clutch C/E retainer.
Install the P3 annulus ring into the P4 sun gear/Clutch C/E retainer and install the snap ring.

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1 - Snap Ring
Install the P3 sun gear/Clutch C/E retainer into the Clutch D drum.

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1 - P3 Planetary Carrier
Install the needle bearing onto the planetary carrier.

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1 - Snap Ring

2 - P3 Planetary Carrier
Install the P3 planetary carrier in the Clutch D drum.
Install the snap ring and verify the relief on the snap ring is set in the locating pin.

Install the Clutch D drum into the P4 annulus drum.

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1 - P2 Annulus/P3 Sun Gear

2 - Clutch D Drum

3 - P4 Annulus Drum

Install the P2 annulus\P3 sun gear in the drum assembly.

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1 - P2 Annulus\P3 Sun Gear

2 - Thrust Bearing and Washer
Install the thrust bearing and washer.
Install the input shaft with P2 planetary carrier into the drum assembly.

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1 - Input Shaft

2 - P2 Planetary Carrier
Install the snap ring in the orientation shown (snap ring will only install one way) with the locating tabs.

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1 - Snap Ring

2 - Snap Ring Locating Tabs

Install the thrust bearing and holding plate onto the P1 planetary carrier.

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1 - Thrust Bearing

2 - Holding Plate

3 - Selectable Shim

Install the selectable shim to the P1 annulus/Clutch B hub.
Install the P1 annulus\Clutch B hub assembly onto the P4 annulus drum.

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1 - P1 Annulus/Clutch B Hub Assembly
Install the O-ring and five squared O-rings on the input shaft.

The Clutch B, 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).

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1 - Cover Plate

2 - Friction Plates

3 - Wave Springs

4 - Steel Plates

5 - Wave Plate

Install the Clutch B discs and plates.

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1 - Input/Output Shaft and P4 Annulus Drum Assembly

2 - Clutch B Discs and Plates

3 - Press Fixture Assembly

4 - Bearing/Gear Splitter

Install the output shaft oil dam and the snap ring.

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1 - Output Shaft Oil Dam Snap Ring
Install the needle bearing (4WD) or ball bearing (2WD).

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1 - Outer Bearing Cup Snap Ring
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.
Install the input/output shaft and P4 annulus drum assembly into the case.

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1 - Input/Output Shaft and P4 Annulus Drum Assembly
From outside the transmission case, install the park pawl shaft and install the park pawl and spring.

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1 - Park Pawl Spring

2 - Park Pawl
Install the park pawl shaft plug into the rear of the case.

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1 - Park Pawl Shaft Plug
Using (special tool #6936, Spacer), install the Manual Park Release (MPR) shaft seal.

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1 - Spacer 6936

2 - Manual Park Release Shaft Seal

Install the MPR shaft, spring, and lever assembly into the case.

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1 - Park Pawl Lock Rod

2 - Fork

3 - Roll Pin

Install the roll pin flush with the MPR lever assembly hub using a suitable pin punch.
Install the park pawl lock rod onto the fork.

Position the park pawl lock rod guide plate, install the three park pawl lock rod guide plate retaining bolts.

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1 - Park Pawl Lock Rod Guide Plate Retaining Bolts

2 - Park Pawl Lock Rod Guide Plate

Using (special tool #10375, Installer, Oil Pump Cover Oil Seal), install the oil pump cover oil seal.

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1 - Oil Pump Cover Oil Seal Installer

2 - Oil Pump Cover

3 - Oil Pump Cover Lip Seal

Position the transmission oil pump housing and oil pump cover together.

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1 - Transmission Oil Pump Housing to Cover Bolts

2 - Transmission Oil Pump Housing

3 - Transmission Oil Pump Front Cover

Install the transmission oil pump housing to cover bolts.
Lube the Clutch A piston inner and outer seals using transmission assembly lube.

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1 - Clutch A Piston Outer Seal

2 - Clutch A Piston Inner Seal
Install the Clutch A piston in the housing.

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1 - Clutch A Piston
Install the Clutch A belleville spring in the housing.

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1 - Clutch A Belleville Spring

Position the oil pump assembly in a suitable arbor press.

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1 - Spring Compressor Tool

2 - Arbor Press

3 - Transmission Oil Pump Assembly

Using (special tool #8285, Compressor, Spring), press on the fingers of the piston retaining ring to remove tension, and install the two halves of the split retainer ring.
Verify the split retainer ring halves are seated in the groove.

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1 - Retaining Ring
Install the hub.

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1 - Hub
Install the Clutch A disks and plates.

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1 - Snap Ring

2 - Clutch A Discs and Plates
Install the snap ring.
Verify the Clutch B seal is not worn or damaged, replace if the seal is questionable.

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1 - Clutch B Piston Seal
Install the Clutch B piston.

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1 - Clutch B Piston
Install the Clutch B damper spring on the assembly.

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1 - Clutch B Damper Spring
Carefully position the oil pump housing assembly into the case.

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1 - Input Shaft O-Ring
Install the NEW input shaft O-ring.
NOTE:
Firmly press the oil pump in place before drawing it in with the bolts.
Install NEW transmission oil pump assembly to case bolts.
NOTE:
The Manual Park Release (MPR) lever can be reversed to release tension and ease the installation of the valve body assembly.

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1 - Transmission Oil Pump Assembly to Case Bolts

Temporarily install the MPR lever to release tension on the shift fork as follows:

Install the MPR lever 180 degrees offset from its original position.
Install the MPR retaining nut and hand tighten.
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.

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1 - Manual Park Release (MPR) Lever Retaining Nut

2 - Manual Park Release (MPR) Lever

3 - Tie Strap

Install the fluid transfer port with NEW O-rings to the transmission case.

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1 - Fluid Transfer Port
Install the (special tool #10379, Pins, Valve Body Alignment) in the transmission case as guides for the valve body assembly.
NOTE:
Make sure the shift fork lines up properly.

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1 - Pins, Valve Body Alignment 10379
Using the valve body alignment pins position the valve body assembly to the transmission.
NOTE:
After several bolts have been hand tightened, remove the guide pins.
Install the valve body assembly bolts.

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1-14 - Valve Body Bolt Installation Sequence
Using (special tool #10377, Remover/Installer, Guide Sleeve), carefully install the electrical harness guide sleeve into the transmission case.

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1 - Guide Sleeve Remover/Installer

2 - Electrical Harness Guide Sleeve

Latch the electrical connector lock by pushing down.

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1 - Valve Body End Bolt

2 - Electrical Connector Lock Bolt

3 - Electrical Connector Lock

Install the valve body end bolt and electrical connector lock bolt.
When installing the Output Speed Sensor (OSS) into the case, take care to position the OSS guide pin as shown below or DAMAGE to the sensor may result. This is the INCORRECT alignment of the pin.

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This is the CORRECT installation and pin alignment.

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Install the output speed sensor and the bolt in the case and tighten to.

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1 - Output Speed Sensor Bolt
Verify the Hydraulic Impulse Solenoid (HIS) accumulator O-ring is not torn or damaged. Replace if necessary.

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1 - Hydraulic Impulse Solenoid (HIS) O-ring

If equipped, install the HIS.

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1 - Hydraulic Impulse Solenoid (HIS) Wire Harness Connector

2 - Hydraulic Impulse Solenoid (HIS) Bolts

Connect the HIS electrical connector.

Remove the tie strap and return the manual release lever to the original position.

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1 - Manual Park Release (MPR) Lever

2 - Manual Park Release (MPR) Lever Retaining Nut

Install the manual release lever nut.
Position the transmission oil pan and gasket.

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1 - Transmission Oil Pan Bolts

2 - Transmission Oil Pan
Install the transmission oil pan bolts.
NOTE:
4X4 only

CAUTION:
The seal must be installed flush with the case. Driving the seal deeper could damage the seal causing a leak.
Position the new output shaft seal over the output shaft and against the transmission case.

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1 - Output Shaft Seal
Using (special tool #9677, Installer, Seal), install the output shaft seal.

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1 - Seal Installer

2 - Output Shaft Seal
If equipped with 4WD , position the extension housing and install the extension housing bolts.

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1 - Extension Housing Bolts

2 - Extension Housing
For 2WD vehicles, using (special tool #5065, Installer, Bearing) install the NEW output flange oil dam into the output flange.

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1 - Output Flange Oil Dam

2 - Bearing Installer

For 2WD vehicles, install the output shaft flange.

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1 - Transmission Output Flange

2 - Transmission Output Flange Nut

3 - Transmission Output Flange Nut Stake

For 2WD vehicles, install a NEW output shaft flange nut and washer using a 34 mm 12 point socket and (special tool #C-3281, Holder, Flange) to hold the flange.
For 2WD vehicles, stake the nut.
Install the torque converter.

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1 - Torque Converter
Before installing the transmission in the vehicle, pre-fill the transmission as outlined in FILL TRANSMISSION AFTER SERVICE. Refer to TRANSMISSION OIL FILL AFTER SERVICE .