General, Technical Data (Rear Final Drive 0bf & 0be (sedan)) Audi A4 B8

SAFETY PRECAUTIONS AND TEST PROCEDURES

Correct Fluid Level

Scheme 234

1. Make sure the rear final drive is filled with the correct quantity of oil. Refer to «ENGINE CODES, TRANSMISSION ALLOCATIONS, RATIOS AND CAPACITIES»(/audi/a4/b8-2007-2012/remont/automatic-trans/#general-technical-data-rear-final-drive-0bf-0be-sedan) .
2. Leaks in the rear final drive, for example, at the sealing surfaces or shaft seals, must be repaired. The gear oil can also leak out of the oil overflow holes between the left -arrow 1- or right -arrow 2- chambers and the rear final drive.

Rear Final Drive Performance.

Replacing Parts on the Transmission

1. The adaptation values for the transmission response (for example, clutch wear, fluid aging) vehicle diagnostic tester must be transferred when the All Wheel Drive (AWD) control module -J492- is replaced otherwise the performance of the rear final drive will be impaired.
2. The clutch classification must be programmed into the AWD control module see vehicle diagnostic tester whenever one of the chambers or the complete rear final drive is replaced. The performance of the rear final drive will be impaired if the AWD control module does not get programmed with the new clutch classification. The classification designation on the rear final drive housing must be made irrecognizable when replacing a chamber. The new classification designation must be made on the housing for the new chamber.
3. Do not lay the rear final drive on any hydraulic control unit components, for example, the clutch valves. This will damage the components.

Replacing the oil pressure/temperature sensor -G437- and/or oil pressure/temperature sensor 2 -G640-.

1. The sensor identity must be adapted in the AWD control module see vehicle diagnostic tester after replacing the oil pressure/temperature sensor or oil pressure/temperature sensor 2.
2. The oil pressure/temperature sensor and oil pressure/temperature sensor 2 should not be replaced together at the same time because a valid sensor identity is needed for the allocation of the rear final drive AWD control module. The AWD control module would interpret the changing of both sensors at the same time as if the rear final drive was replaced. This will erase all adaptation values stored in the control module and will impair the performance of the rear final drive.
3. If both the oil pressure/temperature sensor and oil pressure/temperature sensor must be replaced due to mechanical damage, then this must be performed in two steps. After replacing the first sensor, the AWD control module must be reprogrammed with its identity see vehicle diagnostic tester. Then the same applies to the second sensor.
4. If both the oil pressure/temperature sensor and oil pressure/temperature sensor 2 have to be replaced at the same time due to an electrical malfunction, then the AWD control module must be programmed with the new clutch classification see vehicle diagnostic tester. The ATF must also be replaced. Refer to «ATF IN REAR FINAL DRIVE 0BF AND 0BE, DRAINING»(/audi/a4/b8-2007-2012/remont/axle-shafts/#rear-final-drive-0bf-0be-sedan__atf-in-rear-final-drive-0bf) .

Check the Torque Displacement.

Perform 22 - Check torque displacement

1. Working on the rear final drive wiring
2. Working on the valves: all wheel drive clutch valve -N445- and all wheel drive clutch valve 2 -N446
3. Working on the hydraulic control unit

TORQUE DISPLACEMENT, CHECKING

REAR FINAL DRIVE 0BF AND 0BE IDENTIFICATION

The rear final drive 0BF is installed on the Audi A4 from MY 08, Audi A5 Coupe from MY 08, Audi A5 Cabriolet from MY 09, Audi A6 from MY 11, Audi A7 from MY 11 and Audi A8 from MY 10.

Allocation to the following transmissions

1. 6-speed manual transmission 0B2 AWD
2. 6-speed manual transmission 0B4 AWD
3. 7-speed S-Tronic transmission 0B5 AWD
4. Automatic transmission 0B6 AWD
5. 8-speed automatic transmission 0BK AWD

The rear final drive 0BE is a more powerful version of the 0BF transmission and is installed only in the Audi A8 MY 10 with a V8 TDI engine.

Allocation to the following transmission

1. 8-speed automatic transmission 0BL AWD

Rear Final Drive Allocation

1. «TRANSMISSION ALLOCATIONS, RATIOS AND CAPACITIES»(/audi/a4/b8-2007-2012/remont/automatic-trans/#general-technical-data-rear-final-drive-0bf-0be-sedan__transmission-allocations-ratios-and-capacities)

Classification on the Rear Final Drive

Clutch classification -arrow 1

Scheme 235

Code and build date -arrow 2

Note. The rear final drive "0BF and 0BE" has a hydraulic control unit with the side chambers.

Scheme 236

1. Arrow 1- code letters -LFW
2. Last six characters of serial number -Arrow 2- is the build date (rear final drive date of manufacture) in the format year-month-day; in this case, build date is December 9, 2008

1. Arrow 3- Right clutch classification (classification of the clutch friction values) Example: -272D
2. Arrow 4- Left clutch classification (classification of the clutch friction values) Example: -4A10

The other data is not needed.

Note. When replacing a rear final drive, always pay close attention to the final drive code, the PR number and the engine code. Refer to the electronic parts Information This is the only way to make sure the allocation is correct.

REPAIR INFORMATION

1. To perform a problem-free and successful transmission repair, extreme caution and cleanliness, as well as properly functioning tools are an important requirement. Understandably, general safety guidelines apply when performing repairs.
2. A number of generally applicable instructions for individual repair procedures, which are otherwise mentioned at various points in the repair manual, are summarized under the term "components". Refer to «COMPONENTS»(/audi/a4/b8-2007-2012/remont/automatic-trans/#general-technical-data-rear-final-drive-0bf-0be-sedan__components) . They apply for this repair manual.

SPECIAL TOOLS

See Service Net under Special Tools and Equipment.

COMPONENTS

Rear Final Drive

1. For the correct bolts and other components according to the final drive code, refer to the Parts Information.
2. Check the gear oil level. Refer to «GEAR OIL LEVEL IN REAR FINAL DRIVE 0BF AND 0BE, CHECKING»(/audi/a4/b8-2007-2012/remont/axle-shafts/#rear-final-drive-0bf-0be-sedan__gear-oil-level-in-rear-final) and the ATF level, refer to «ATF LEVEL IN REAR FINAL DRIVE 0BF AND 0BE, CHECKING»(/audi/a4/b8-2007-2012/remont/axle-shafts/#rear-final-drive-0bf-0be-sedan__atf-level-in-rear-final-drive) in the final drive when replacing the rear final drive and fill if necessary.
3. Capacities and specifications, refer to «ENGINE CODES, TRANSMISSION ALLOCATIONS, RATIOS AND CAPACITIES»(/audi/a4/b8-2007-2012/remont/automatic-trans/#general-technical-data-rear-final-drive-0bf-0be-sedan) .
4. Clean the contact surfaces before installing the brackets and waxed components. Contact surfaces must be free of wax and grease.
5. Thoroughly clean all connections and the surrounding area before disconnecting.

ATF and Gear Oil

The rear final drive 0BF and 0BE have separated chambers for the ATF and gear oil.

1. Only the ATF available as a replacement part may be used for the hydraulic components (hydraulic control unit and the left and right chambers). Refer to the Parts Information.
2. Only the gear oil available as a replacement part may be used for the final drive (drive train, differential). Refer to the Parts Information.
3. Using other ATF or gear oil will cause the final drive to malfunction.

Oil, Environment and Disposal Regulations

1. Be very careful when handling ATF, transmission fluid and other fluids.
2. Dispose of the drained fluids properly.
3. Follow all environment and disposal regulations.
4. Be sure to read the instructions on the fluid containers.

Sealant

1. Thoroughly clean the separating surfaces on the housing before applying the sealant.
2. Apply the sealant D 176 501 A1 evenly and not too thick.
3. Do not get any sealant in the vent holes or oil channels.

Shaft Seals

1. Lightly coat the shaft seals on the outer circumference with oil before installing
2. The open side on the shaft seals faces the fluid to be sealed off.
3. Check the gear oil level. Refer to «GEAR OIL LEVEL IN REAR FINAL DRIVE 0BF AND 0BE, CHECKING»(/audi/a4/b8-2007-2012/remont/axle-shafts/#rear-final-drive-0bf-0be-sedan__gear-oil-level-in-rear-final) or the ATF level, refer to «ATF LEVEL IN REAR FINAL DRIVE 0BF AND 0BE, CHECKING»(/audi/a4/b8-2007-2012/remont/axle-shafts/#rear-final-drive-0bf-0be-sedan__atf-level-in-rear-final-drive) in the final drive after replacing the shaft seals.

Flange/Driveshaft Seal

Scheme 237

1. Fill the space between the lips -arrow- halfway with sealing grease G 052 128 A1.

Flange Shaft Seals

Scheme 238

1. Coat the space between the sealing lips -arrow- with ATF.

O-rings, Seals and Gaskets

1. Always replace the O-rings, seals and gaskets.
2. Check the contact surfaces on the housing and shaft for burrs and damage after removing the seals.
3. Thoroughly clean the separating surfaces on the housing before assembling.
4. Lightly lubricate O-rings before installing, this prevents the O-rings from being pinched when inserting.
5. Check the gear oil level. Refer to «GEAR OIL LEVEL IN REAR FINAL DRIVE 0BF AND 0BE, CHECKING»(/audi/a4/b8-2007-2012/remont/axle-shafts/#rear-final-drive-0bf-0be-sedan__gear-oil-level-in-rear-final) or the ATF level, refer to «ATF LEVEL IN REAR FINAL DRIVE 0BF AND 0BE, CHECKING»(/audi/a4/b8-2007-2012/remont/axle-shafts/#rear-final-drive-0bf-0be-sedan__atf-level-in-rear-final-drive) in the final drive after replacing the gaskets, seals and O-rings.

Circlips

Scheme 239

1. Do not stretch the circlips.
2. Always replace damaged or stretched circlips.
3. The circlips must touch the bottom of the groove.
4. Replace the adapter sleeves. Installation position: Slot -A- is longitudinal to line of force -arrow-.

Bolts and Nuts

1. Loosen and tighten the bolts and nuts from the covers and housings diagonally.
2. Do not cant, rather loosen and tighten especially sensitive parts in diagonal manner in stages.
3. Tightening specifications for unoiled bolts and nuts are given.
4. Always replace self-locking nuts and bolts.
5. Using a wire brush, clean threads of bolts (replace outer driveshaft bolts) which are secured with locking compound. Install the bolts with locking fluid AMV 185 101 A1.
6. If self-locking bolts were installed or if regular bolts were installed with locking fluid, then the threaded holes must be cleaned with a thread cutter. If the holes are not cleaned, then the bolts could break off the next time they are removed.

Scheme 240

1. 1 - Transmission
2. 2 - Driveshaft
3. 3 - Rear Final Drive

TRANSMISSION ALLOCATIONS, RATIOS AND CAPACITIES

The following information can be found in the electronic parts Information.

1. Date of manufacture
2. Engine, manual transmission and automatic transmission allocation using code letters and PR numbers.

See also:
• ATF IN REAR FINAL DRIVE 0BF AND 0BE, DRAINING
• TORQUE DISPLACEMENT, CHECKING
• GEAR OIL LEVEL IN REAR FINAL DRIVE 0BF AND 0BE, CHECKING
• ATF LEVEL IN REAR FINAL DRIVE 0BF AND 0BE, CHECKING
• MAINTENANCE, DIAGNOSIS
• ENGINE CODES, TRANSMISSION ALLOCATIONS, RATIOS AND CAPACITIES
• TRANSMISSION ALLOCATIONS, RATIOS AND CAPACITIES
• SAFETY PRECAUTIONS AND TEST PROCEDURES
• COMPONENTS