Center Differential Housing, Transmission Installed

WARNING: This page is about a different car, the 2010 Audi A4 and 2009 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Engine/Transmission Jack V.A.G 1383 A
Transmission Support T10337
Counterhold Tool T10172
Adapter T10172/5
Oil Collecting and Extracting Device V.A.G 1782
Torque Wrench V.A.G 1331
Protective eyewear

Removing

Transmission installed.

CAUTION:

There is a risk of damaging the transmission.

Do not let the engine run or tow vehicle without gear oil.

NOTE:

General repair instructions, refer to REPAIR INFORMATION .

Clean working conditions for the automatic transmission, refer to CLEAN WORKING CONDITIONS .

-- Loosen the quick-release fasteners -2 through 4- and remove the noise insulation. Refer to Removal and Installation .

Fig 1: Identifying Noise Insulation

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NOTE:

Ignore -arrow-.

CAUTION:

The decoupling element in the front exhaust pipe could be damaged.

Do not bend the decoupling elements in the front exhaust pipe more than 10°.

-- Vehicles with one front exhaust pipe: Disconnect exhaust system at double clamp -arrow-.

Fig 2: Loosening Clamping Sleeve

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-- Vehicles with 2 front exhaust pipes: Disconnect the exhaust system at the clamping sleeves -1- and -2-.

Fig 3: Exhaust System Clamping Sleeves

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-- Remove the bolts -arrows- and remove the driveshaft heat shield.

Fig 4: Driveshaft Heat Shield - Tightening Specification

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-- Remove the bolt connecting the driveshaft to the transmission. To do this, use the T10172 and T10172/5.

Fig 5: Hold Driveshaft Using T10172

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-- Press the driveshaft together with rear final drive; the universal joint is able to slide axially.

-- Tie the driveshaft to the side.

CAUTION:

Danger of damaging the transmission fluid pan.

Never use the transmission fluid pan as a support for the transmission.

-- Support the transmission to the tunnel crossmember using the V.A.G 1383 A and T10337.

WARNING:

There is the risk of an accident.

The V.A.G 1383 A may only be used during assembly and must not sit unsupervised under the vehicle.

-- Remove the bolts from the tunnel crossmember -arrows-.

Fig 6: Identifying Tunnel Crossmember

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NOTE:

Shown without the V.A.G 1383 A.

-- Lower the transmission to dimension -a- using the V.A.G 1383 A.

Fig 7: Lower Transmission

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Dimension -a- = maximum 100 mm.

-- Place the V.A.G 1782 under the transmission.

WARNING:

Danger of eye injury.

Wear protective eyewear.

NOTE:

The housing does not have an oil drain plug. The axle oil can only be drained by removing the housing.

-- Place a cloth on the tunnel crossmember so the oil does not leak onto it.

-- Loosen and remove the center differential housing bolts in the sequence -6 to 1- and drain the gear oil.

Fig 8: Center Differential Housing - Tightening Sequence

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CAUTION:

Transmission components could be damaged.

Carefully remove the center differential housing from the transmission toward the rear. Otherwise the center differential could fall out of the transmission.

-- Secure the center differential -1- so it does not fall out or remove it toward the rear from the input shaft.

Fig 9: Identifying Center Differential

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NOTE:

There are different versions of the center differential -1-.

Installing

Install in reverse order, paying attention to the following:

NOTE:

Replace the center differential housing O-ring.

If the center differential -1- was removed:

-- Position the center differential on the input shaft splines. Rotate the center differential slightly when doing this.

-- Make sure the center differential can be turned by hand.

-- Place the housing with the input shaft installed on the center differential. Rotate the housing slightly if necessary.

-- Tighten the center differential housing bolts Fig 10.

Fig 10: Center Differential Housing - Tightening Sequence

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-- Clean and install the tunnel crossmember. Refer to TUNNEL CROSSMEMBER .

-- Install the driveshaft. Refer to Removal and Installation or Removal and Installation .

-- Install exhaust system and adjust free of tension. Refer to DESCRIPTION AND OPERATION .

-- Fill gear oil in transfer case. Refer to TRANSFER CASE GEAR OIL, FILLING AFTER REPAIR .