8HP75 - Disassembly

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.

DISASSEMBLY

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 .

NOTE:

Tag all clutch pack assemblies as they are removed, for reassembly identification.

Remove the torque converter.
NOTE:
4X4 Only.

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1 - Torque Converter
If equipped, remove the transmission housing extension housing bolts and remove the extension housing.
NOTE:
4X4 Only.

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1 - Extension Housing Bolts

2 - Extension Housing
Remove the transmission output shaft seal with a suitable slide hammer and screw.
NOTE:
4X4 Only.

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1 - Output Shaft Seal
Remove the output shaft snap ring.
NOTE:
2WD Only.

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1 - Output Shaft Snap Ring

Remove the output shaft flange locknut staking.

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1 - Transmission Output Flange

2 - Transmission Output Flange Nut

3 - Transmission Output Flange Nut Stake

Using a flange holder (special tool #C-3281, Holder, Flange), remove the output shaft flange nut.
Remove the output shaft flange and output shaft seal.
Remove the transmission oil pan bolts.
NOTE:
Inspect the gasket for reuse. If the seal is cut or torn, replace the gasket.

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1 - Transmission Oil Pan Bolts

2 - Transmission Oil Pan
Carefully remove the transmission oil pan and gasket.

If equipped, disconnect the Hydraulic Impulse Solenoid (HIS) connector.

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1 - Hydraulic Impulse Solenoid (HIS) Wire Harness Connector

2 - Hydraulic Impulse Solenoid (HIS) Bolts

If equipped, remove bolts and the HIS accumulator.
Verify the seal on the input end of the HIS is not torn or cut. Replace the seal if it looks worn or damaged.

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1 - Hydraulic Impulse Solenoid (HIS) Seal

Remove the valve body end bolt.

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1 - Valve Body End Bolt

2 - Electrical Connector Lock Bolt

3 - Electrical Connector Lock

Remove the electrical connector lock bolt.
Lift the electrical connector lock to release the internal harness end from inside the transmission for valve body removal.
Remove the Output Speed Sensor (OSS) bolt and gently lift the output speed sensor out from the case.

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1 - Output Speed Sensor Bolt
Using (special tool #10377, Remover/Installer, Guide Sleeve), carefully pull the electrical harness guide sleeve straight out from the transmission case.

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1 - Remover/Installer, Guide Sleeve

2 - Electrical Harness Guide Sleeve
Remove the valve body bolts in the sequence shown and remove the valve body.

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1 - Fluid Transfer Port

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1-14 - Valve Body Bolt Removal Sequence
Remove the fluid transfer port from the transmission or valve body assembly (the transfer port may stick in the valve body during removal).
Inspect the fluid transfer port O-rings for damage or wear and replace as necessary.
Remove and DISCARD the transmission oil pump assembly to case bolts.
NOTE:
Remove the input shaft O-ring before the oil pump is removed.

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1 - Transmission Oil Pump Assembly to Case Bolts
Remove the input shaft O-ring using a small pick or equivalent.

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1 - Input Shaft O-Ring
Carefully pry the oil pump housing away from the case with a small flat blade screwdriver or equivalent through the case opening.

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1 - Transmission Oil Pump Assembly
From the front of the transmission, remove the oil pump housing.
Remove the Clutch B damper spring.

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1 - Clutch B Damper Spring
Remove the Clutch B piston from the assembly.

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1 - Clutch B Piston
Check the Clutch B piston seal for damage or wear and replace if necessary.

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1 - Clutch B Piston Seal
Remove the snap ring.

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1 - Snap Ring

2 - Clutch A Discs and Plates
Remove the Clutch A disks and plates.
Remove the hub.

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1 - Hub

Position the oil pump housing 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.
Remove the two halves of the retaining ring.

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1 - Retaining Ring
Remove the Clutch A belleville spring.

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1 - Clutch A Belleville Spring
Remove the Clutch A piston (1) by rotating and gently lifting.

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1 - Clutch A Piston
Inspect the inner and outer piston seals for wear or damage and replace as necessary.

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1 - Clutch A Piston Outer Seal

2 - Clutch A Piston Inner Seal

Remove the transmission oil pump housing to cover bolts and separate the transmission oil pump housing from the transmission oil pump front cover.

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1 - Transmission Oil Pump Housing to Cover Bolts

2 - Transmission Oil Pump Housing

3 -Transmission Oil Pump Front Cover

Remove and DISCARD the oil pump housing O-ring seal.

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1 - Seal Remover

2 - Slide Hammer

3 - Front Pump Cover Oil Seal

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1 - Oil Pump Front Cover O-Ring Seal

Using (special tool #9667, Remover, Seal) and (special tool #C-3752, Slide Hammers), remove the oil seal from the front pump cover.
Remove the snap ring.

Using (special tool #6787A, Remover, Bearing Cup) and (special tool #C-3752, Slide Hammers), remove the needle bearing from the front cover.

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1 - Bearing Cup Remover

2 - Slide Hammer

3 - Front Pump Cover

Remove the front pump needle bearing snap ring.
Using (special tool #9585, Remover, Bearing Cup) and (special tool #C-637, Slide Hammer, Universal) remove the front pump needle bearing.

Remove the Manual Park Release (MPR) lever retaining nut and remove the lever.

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1 - Manual Park Release (MPR) Lever

2 - Manual Park Release (MPR) Lever Retaining Nut

Remove the three park pawl lock rod guide plate retaining bolts and remove the plate.

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1 - Park Pawl Lock Rod Guide Plate Retaining Bolts

2 - Park Pawl Lock Rod Guide Plate

Remove the park pawl lock rod from the fork.

NOTE:

Pay attention to the spring position for installation.

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1 - Park Pawl Lock Rod

2 - Fork

3 - Roll Pin

Remove the roll pin from the MPR shaft using a suitable pin punch.
Remove the MPR shaft, spring and lever assembly from the case.
Remove the selector shaft seal using a small screwdriver or equivalent.
Remove the park pawl shaft plug from the rear of the case.
NOTE:
Pay attention to the spring position for installation.

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1 - Park Pawl Shaft Plug
Remove the park pawl shaft using a suitable pin punch (Notation arrow for location and drive-out direction), remove the park pawl and spring.
NOTE:
The transmission must be in a vertical position before the main stack is removed, so damage to the drums do not occur.

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1 - Park Pawl Spring

2 - Park Pawl
Remove the input/output shaft and P4 annulus drum assembly from the case.

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1 - Input/Output Shaft and P4 Annulus Drum Assembly
Remove the outer bearing cup snap ring.
NOTE:
4X4 shown, 2WD similar.

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1 - Outer Bearing Cup Snap Ring

Using (special tool #9664, Remover, Bearing Cup) and (special tool #C-637, Slide Hammer, Universal), remove the outer bearing cup.

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1 - Bearing Cup Remover,

2 - Slide Hammer

3 - Outer Bearing Cup

Remove the output shaft oil dam snap ring.

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1 - Output Shaft Oil Dam Snap Ring

Using (special tool #9664, Remover, Bearing Cup) and (special tool #C-637, Slide Hammer, Universal), remove the output shaft oil dam.

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1 - Bearing Cup Remover

2 - Slide Hammer

3 - Output Shaft Oil Dam

Position the input/output shaft and P4 annulus drum assembly on (special tool #8925-3, Assembly, Press Fixture) and (special tool #1130, Splitter, Bearing/Gear).

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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

Remove the Clutch B discs and plates.
Remove the O-ring and five squared O-rings from the input shaft.

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1 - P1 Annulus/Clutch B Hub Assembly
Remove the P1 annulus/Clutch B hub assembly from the P4 annulus drum.

Remove the selectable shim from the P1 annulus/Clutch B hub.

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1 - Thrust Bearing

2 - Holding Plate

3 - Selectable Shim

Remove the thrust bearing and holding plate from the P1 planetary carrier.
NOTE:
The (special tool #10378, Rings, Support) are three pieces intended to be used in multiple locations around the drum to prevent damage from prying.
Position the (special tool #10378, Rings, Support) on the P4 annulus drum assembly to protect the drum.
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.

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1 - Snap Ring

2 - Snap Ring Openings
Using a suitable tool release the snap ring by prying in and up from the opposite side of the snap ring openings.
Remove the P1 planetary carrier.
Remove the input shaft with P2 planetary carrier from the drum assembly.

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1 - P2 Planetary Carrier

2 - Thrust Bearing and Washer
Remove the thrust bearing and washer.

Remove the P2 annulus/P3 sun gear from the P4 annulus drum assembly.

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1 - P2 Annulus/P3 Sun Gear

2 - Clutch D Drum

3 - P4 Annulus Drum

Remove the Clutch D drum from the P4 annulus drum.
NOTE:
The (special tool #10378, Rings, Support) are three pieces intended to be used in multiple locations around the drum to prevent damage from prying.
Position the (special tool #10378, Rings, Support) on the P4 annulus drum assembly to protect the drum.

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1 - Snap Ring

2 - P3 Planetary Carrier
Using a suitable tool, release and remove the snap ring holding down the P3 Planetary Carrier.
Remove the P3 planetary carrier.

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1 - P3 Planetary Carrier
Remove the thrust bearing from the P3 planetary carrier.
Remove the P4 sun gear/Clutch C/E retainer from the Clutch D drum.

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1 - P4 Sun Gear/Clutch C/E Retainer

2 - Clutch D Drum
Remove the snap ring from the P4 sun gear/Clutch C/E retainer and remove the annulus ring.

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1 - Snap Ring
Remove the snap ring (1) from the P4 sun gear/Clutch C/E retainer.

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1 - Snap Ring

2 - Clutch E
Remove Clutch E (2) from the P4 sun gear/Clutch C/E retainer.
Remove the thrust bearing from Clutch E (2).
NOTE:
Thrust bearing may stick to sun gear upon removal.

NOTE:
Clutch E and Clutch C are similar. The Clutch C hub is removable and has six friction plates.
Remove Clutch C from the P4 sun gear/Clutch C/E retainer.

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1 - Clutch C
Remove the bearings from the top and bottom of Clutch C.
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.

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1 - P4 Planetary Carrier/Output Shaft Lock Ring
Remove the snap ring from the P4 annulus drum.

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1 - Snap Ring

2 - P4 Annulus
Remove the P4 annulus from the P4 annulus drum.

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:

NOTE: