8HP50 - Disassembly

WARNING: This page is about a different variant/trim than selected.

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.

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1 - Torque Converter

Remove the torque converter.

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1 - Extension Housing Bolts

2 - Extension Housing
4X4 ONLY, If equipped, remove the transmission housing extension bolts and remove the extension housing.

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1 - Transmission Output Shaft Seal
Remove the transmission output shaft seal with a suitable slide hammer and screw.

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1 - Output Shaft Snap Ring

NOTE:
4X4 only

Remove the output shaft snap ring.

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1 - Output Shaft Flange Locknut Staking

2 - Output Shaft Flange

3 - Output Shaft Flange

NOTE:

2WD only.

Remove the output shaft flange locknut staking.
Using a flange holder (special tool #C-3281, Holder, Flange), remove the output shaft flange nut.
Remove the output shaft flange and inspect the output shaft flange sealing surface for damage, replace as needed.

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1 - Transmission Oil Pan Bolts

2 - Transmission Oil Pan
Remove the transmission oil pan bolts.
NOTE:
Inspect the gasket for reuse. If the seal is cut or torn, replace the gasket.

Carefully remove the transmission oil pan and gasket.

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1 - Hydraulic Impulse Oil Storage (H.I.S) Connector

2 - Hydraulic Impulse Oil Storage (H.I.S) Bolts

If equipped, disconnect the Hydraulic Impulse Oil Storage (H.I.S) connector.
If equipped, remove bolts and the H.I.S. accumulator.

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1 - Hydraulic Impulse Oil Storage (H.I.S) Seal

Verify the H.I.S. seal is not torn or cut. Replace the seal if it looks worn or damaged,

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1 - Valve Body Assembly End Retainer Bolt

2 - Valve Body Assembly End Retainer Bolt

3 - Electrical Connector Lock

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

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1 - Output Speed Sensor Bolt
Remove the Output Speed Sensor bolt and gently lift the Output Speed Sensor out from the case.

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1 - Remover/Installer, Guide Sleeve 10377

2 - Electrical Harness Insulator
Using (special tool #10377, Remover/Installer, Guide Sleeve), carefully pull the electrical harness insulator straight out from the transmission case.

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1-14 - Valve Body Assembly Bolts
Remove the valve body assembly bolts in the order shown in illustration and remove the valve body.

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1 - Fluid Port
Remove the fluid port from the transmission or valve body assembly (the fluid port may stick in the valve body upon removal).
Inspect the fluid port O-rings for damage or wear and replace as necessary.

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1 - Oil Pump Housing Bolts
Remove and DISCARD the oil pump housing bolts.

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1 - Input Shaft O-ring

NOTE:
Remove the input shaft O-ring before the oil pump is removed.
Remove the input shaft O-ring using a small pick or equivalent.

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1 - Oil Pump Housing Pry Point
Carefully pry the oil pump housing away from the case with a small flat blade screwdriver or equivalent through the case opening.
From the front of the transmission, remove the oil pump housing.

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1 - B Clutch Spring Damper
Remove the B clutch spring damper.

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1 - B Clutch Piston
Remove the B clutch piston from the assembly.

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

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1 - A Clutch Snap Ring

2 - A Clutch Elements
Remove the A clutch snap ring.
Remove the A clutch elements.

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1 - Hub

Remove the hub.

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1 - Compressor, Spring 8285

2 - Arbor Press

3 - Oil Pump Housing Assembly

Position the oil pump housing assembly in a suitable arbor press.
Using (special tool #8285, Compressor, Spring), press on the fingers of the piston retaining ring to remove tension.

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1 - Retainer Halves
Remove the retainer halves from the clutch housing.

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1 - A Clutch Belleville Spring
Remove the A clutch belleville spring.

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1 - A Clutch Piston
Remove the A clutch piston (1) by rotating and gently lifting.

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1 - A Clutch Piston Inner Piston Seal

2 - A Clutch Piston Outer Piston Seal

Inspect the inner and outer A clutch piston seals for wear or damage and replace as necessary.

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1 - Oil Pump Housing Bolts

2 - Oil Pump Housing

3 - Oil Pump Cover

Remove the bolts and separate the oil pump housing from the oil pump cover.

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1 - Remover, Seal 9667

2 - Slide Hammer C-3752

3 - Torque Converter Oil Seal

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

Remove the snap ring.

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1 - Remover, Bearing Cup 6787A

2 - Slide Hammer C-3752

3 - Needle Bearing

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

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1 - Manual Park Release Lever

2 - Manual Park Release Lever Nut
Remove the manual park release lever nut and remove the lever.

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1 - Pawl Lock Rod Guide Plate Bolts

2 - Pawl Lock Rod Guide Plate

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

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1 - Park Pawl Lock Rod

2 - Manual Park Release Lever Assembly

3 - Manual Park Release Lever Roll Pin

Remove the park pawl lock rod from the fork.
NOTE:
Pay attention to the spring position for installation.
Remove the manual park release lever roll pin using a suitable pin punch.
Remove the shaft, spring and manual park release lever assembly from the case.
Remove the manual park release shaft seal using a small screwdriver or equivalent.

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1 - Park Pawl Shaft Plug
Remove the park pawl shaft plug from the rear of the case.

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1 - Park Pawl Spring

2 - Park Pawl

NOTE:
Pay attention to the spring position for installation.
Remove the park pawl shaft using a suitable pin punch (Notation arrow for location and drive-out direction), remove the park pawl and park pawl spring.

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1 - P4 Annulus Drum Assembly

NOTE:
The transmission must be in a vertical position before the main stack is removed, so damage to the drums do not occur.
Remove the input/output shaft and P4 annulus drum assembly from the case.

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1 - Output Shaft Bearing Cup Snap Ring

Remove the output shaft bearing cup snap ring.

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1 - Remover, Bearing Cup 9664

2 - Slide Hammer, Universal C-637

3 - Output Shaft Bearing Cup

NOTE:

4X4 shown in illustration, RWD similar.

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

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1 - Output Shaft Oil Dam Snap Ring

Remove the output shaft oil dam snap ring.

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1 - Remover, Bearing Cup 9664

2 - Slide Hammer, Universal C-637

3 - Output Shaft Oil Dam

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 - Input/Output Shaft And P4 Annulus Drum Assembly

2 - B Clutch Pack

3 - Assembly, Press Fixture 8925-3

4 - Splitter, Bearing/Gear 1130

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).
Remove the B clutch pack.

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

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

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1 - Thrust Bearing

2 - Thrust Bearing Holding Plate

3 - Selectable Shim

Remove the selectable shim from the P1 annulus/B clutch hub.
Remove the thrust bearing and holding plate from the P1 planetary carrier.

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1 - Snap Ring

2 - Snap Ring Openings

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.
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.

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1 - Input Shaft With P2 Planetary Carrier

2 - Thrust Bearing And Washer
Remove the input shaft with P2 planetary carrier from the drum assembly.

Remove the thrust bearing and washer.

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1 - P2 Annulus/P3 Sun Gear

2 - D Clutch Drum

3 - P4 Annulus Drum

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

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1 - P3 Planetary Carrier Snap Ring

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

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1 - P3 Planetary Carrier
Remove the P3 planetary carrier.
Remove the thrust bearing from the planetary carrier.

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1 - P4 Sun Gear/C/E Clutch Retainer

2 - D Clutch Drum
Remove the P4 sun gear/C/E clutch retainer from the D clutch drum.

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1 - P4 Sun Gear/C/E Clutch Annulus Gear Snap Ring
Remove the P4 sun gear/C/E annulus gear snap ring and remove the annulus gear.

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1 - P4 Sun Gear/C/E Clutch Retainer Snap Ring

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

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1 - C-Clutch

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

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1 - P4 Planetary Carrier/Output Shaft Lock Ring Locking Tabs
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 - Snap Ring

2 P4 Annulus
Remove the snap ring from the P4 annulus drum.
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 CAPACITIES AND RECOMMENDED FLUIDS .

CAUTION:

NOTE: