BMW X3 Service & Repair Manual: Removing and installing automatic transmission (GA8HP45Z) (N55)

BMW X3 Service & Repair Manual / Transmission / Transmission in general / Removing and installing automatic transmission (GA8HP45Z) (N55)

Special tools required:

  • 24 4 161
  • 24 4 166
  • 24 4 160
  • 24 2 390
  • 23 4 050
  • 00 2 030
  • 24 1 110

IMPORTANT: To prevent heavy damage to the engine block, the protruding thread of the transmission bolts absolutely must be checked for damage and corrosion before removal. If there are signs of corrosion, the rust must be removed and the threads must be cleaned before removal. Replace rusted, damaged screws.

Failure to comply with this instruction will result in serious damage to the engine block and transmission.

IMPORTANT: After completion of repair work, check TRANSMISSION OIL LEVEL .

Use only the approved TRANSMISSION OIL .

Failure to comply with this requirement will result in serious damage to the automatic transmission! IMPORTANT: For vehicles with N54/N55 engine up to production date 09/2012, aluminum bolts for the for the securing of the transmission are also installed.

As of production date 09/2012, only steel bolts are installed for the securing of the transmission.

NOTE: Aluminium screws/bolts must be replaced each time they are released .

Aluminium screws/bolts are permitted with and without color coding (blue).

For reliable identification: Aluminium screws/bolts are not magnetic.

Jointing torque and angle of rotation must be observed without fail (risk of damage) .

The aluminum bolts can be optionally replaced by steel bolts.

Necessary preliminary tasks:

  • Disconnect the BATTERY
  • Remove FAN COWL
  • Remove underbody protection

    Important installation notes are described in this job item

  • Release hose socket from charge air cooler on left and right.
  • Remove heat shields
  • Detach PROPELLER SHAFT at gearbox, release center bearing
  • Tie up propeller shaft to underbody.
  • Note:
  • Bending the propeller shaft by an excessive angle can cause premature damage to the joint/propeller shaft!
  • Support engine with jack when removing gearbox

Remove upper part of cable duct (1).


Release screw (1).

Disconnect hydraulic lines (2) to transmission oil cooler.

Installation note: Replace sealing rings.


Release holder (1).

Detach hydraulic lines (2) from bracket (1).


Release screws (1).

Slacken nut (2).

Remove bracket (3).


Release screws (1).

Remove holder (2).

Remove heat shield (3).


Prepare special tool (1) 24 4 161 (A) with shaped element (2) 24 4 166 as pictured.


Insert special tool 24 4 160 into recess of transmission housing and clamp gently with screw (1).

Raise by turning screw (2) and clamp down.

Then tighten down screw (1).


  • Unlock and disconnect connector (1) by turning.
  • Do not touch pins.
  • Release cable from brackets.
  • Insert special tool 24 2 390 in sealing cup.

Tasks are described in Gearbox holder.


IMPORTANT: Read and comply with important note.


Supporting transmission:

Support transmission with special tools 23 4 050 , 00 2 030 .

Secure transmission to mounting with tensioning strap (1).

Tasks are described in TRANSMISSION BRACKET.

After completion of work, check transmission fluid level.


Release screws.

Remove cross member.


Unplug connector (1) from transfer box control unit (longitudinal torque module).

Release screw (2).

Remove earth strap (3).


Crank engine at vibration damper in direction of rotation until screw (1) is visible in recess.

Release all 6 bolts of torque converter with special tool 24 1 110 .

Installation note: Replace converter screws. Remove any remaining adhesive residue from the thread.


Note installed position of brackets (1 and 2) when removing gearbox.


Release screws.

Installation note:

Observe screw fastening sequence without fail.

Aluminium screws must be replaced.

Tightening torque and angle of rotation Aluminium screws 24 00 2AZ (7, 8, 9, 10, 11)


Installation note:

Bore hole (1) of driving plate must be accessible from recess on engine oil sump. Check that fitting sleeves (2...3) are correctly seated.

Replace damaged fitting sleeves.

NOTE: Similar to graphic.


Installation note:

Rotate torque converter until bore hole in torque converter is flush with bore hole in drive plate.

Flange automatic transmission to engine.

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