27 10 010 Removing and installing transfer box (ATC 350)

Special tools required: 

• 00 2 030
• 23 4 050

Necessary preliminary work 

• Disconnect BATTERY EARTH LEAD
• Remove underbody protection
• Remove complete exhaust system  . See 18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (N55) or 18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (N63)
• Remove heat shields
• Disconnect PROPELLER SHAFT at gearbox, release center mount
• Tie back propeller shaft to underbody
• Important: 
• An excessive deflection angle of the propeller shaft may damage the joint/propeller shaft!
• Support gearbox with jack when removing the transfer box.

Release screws.

Tightening torque 26 11 7AZ .

Remove front propeller shaft at output flange of transfer box and tie to one side.

Installation note: 

Replace screws.

Fig 1: Locating Front Propeller Shaft Output Flange Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Supporting Transmission Using Special Tools (00 2 030 And 23 4 050)

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Remove cooling air duct (2).

Fig 3: Identifying Cooling Air Duct Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Undo bolts (1) for gearbox mount.

Tightening torque 22 32 10AZ .

Fig 4: Identifying Gearbox Mount Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws.

Remove transmission cross member.

Tightening torque 22 32 3AZ .

Tightening torque 22 32 6AZ .

Fig 5: Locating Transmission Cross Member Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Disconnect connector (1) from transfer box control unit (linear force module) (2).

Fig 6: Identifying Connector From Transfer Box Control Unit (Linear Force Module)

Courtesy of BMW OF NORTH AMERICA, INC.

Slightly lower gearbox.

Release screw connection of transfer box.

Tightening torque 27 10 1AZ .

Remove transfer box.

Installation note: 

Pay attention to dowel pin (1).

Grease dowel pin (1).

Apply a thin coat of grease to gearing.

Grease: WEICON ANTI-SEIZE.

Fig 7: Identifying Dowel Pin

Courtesy of BMW OF NORTH AMERICA, INC.