BMW X3 Service & Repair Manual: Removing and installing automatic transmission (GA8HP45Z) (N20)

BMW X3 Service & Repair Manual / Transmission / Transmission in general / Removing and installing automatic transmission (GA8HP45Z) (N20)

Special tools required:

  • 2 222 741
  • 24 2 390
  • 23 4 050
  • 00 2 030

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!

Necessary preliminary tasks:

  • Clamp off BATTERY .
  • Remove underbody protection .

    Important notes on installation are described in this work step.

  • Remove front PROPELLER SHAFT .
  • Disconnect PROPELLER SHAFT at transmission, release center mount.
  • Note:
  • Bending the propeller shaft by an excessive angle can cause premature damage to the joint/propeller shaft!
  • Tie up the propeller shaft to the vehicle underbody.
  • Support engine with lifter when removing transmission.

Release screw (1).

Remove holder (2).


Release screws (1).

Remove the protective plate (2).


Release screw (1).

Disconnect hydraulic lines (2) to transmission oil cooler.

Installation note: Replace sealing rings.


Unscrew nuts (1).

Unfasten screws (2).

Remove bracket (3) and catalytic converter (5).

Unscrew nuts (4).

Remove rubber mounts for catalytic converter.


Release screws (1).

Remove cover plate (2) downwards.

Remove cover.


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

Undo all 6 bolts on torque converter.

IMPORTANT: Replace all 6 bolts on torque converter.


Unscrew knurled screw (1) from special tool 2 222 741 (do not remove completely) before inserting in the recess of the transmission housing.

Insert special tool 2 222 741 and shaped element (3) in the recess.

Slightly tighten knurled nut (2).

Screw in knurled screw (1) fully.

  • Locating pin (4) must be located between converter and engine.

Move special tool 2 222 741 in the recess until the locating pin (4) rests against the converter.

Use knurled nut (2) to fix special tool 2 222 741 and converter in position.


  • 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.


Release screws.

Remove cross member.


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

Release screw (2).

Remove earth strap (3).


Release screws.


Installation note:

Check that fitting sleeves (1) are correctly seated.

Replace damaged fitting sleeves.


Installation note:

Twist torque converter until bore hole in torque converter is flush with bore hole of flywheel.

Flange automatic transmission to engine.

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