M/T - Service Modifications

91audi05

Group: 35

Number: 91-02

Date: July 31, 1991


Subject: 01A All wheel drive, 5-speed transmission modifications


Model(s): 80/90/Coupe Quattro with 01A transmission all m.y.





Transmission modifications

Reverse gear

Beginning with transmission date 20 08 0, the reverse gear teeth on the main shaft and those of the reverse gear have been lengthened as follows:

^ dimension a = current: 54.50 mm
New: 56.50 mm





^ dimension a = current: 18.3 mm
New: 19.7 mm

Note

The new mainshaft can be installed in earlier transmissions (before 20 08 0) but the needle bearing must be installed 2.0 mm deeper (see Mainshaft needle bearing installation on this page).





Main shaft needle bearing installation

Beginning with transmission date 20 08 0, the main shaft needle bearing in the final drive housing is installed 2.0 mm deeper.

^ dimension a = current: 214 mm
New: 216 mm





The final drive housing is slightly milled-out in the reverse gear area (arrow).

Note

The new reverse gear can only be installed in transmissions that have the revised housing and main shaft.





Tensioning cable mounting

Beginning with transmission date 20 08 0, the tensioning cable mount on the transmission was changed.
^ dimension a = current: 23.5 mm
New: 31.5 mm

Beginning in 9/90 a mounting hole in the housing replaces the previously used mounting stud (arrow). The tensioning cable bracket is then provided with a mounting stud.

Note

Change the cable bracket when installing a new transmission.





Rear pinion needle bearing deleted

Beginning with transmission date 24 08 0, the rear needle bearing (arrow 1) is deleted.

The pinion is now supplied with a needle bearing in the Torsen differential (arrow 2).

Note

The pinion and Torsen differential with the revised bearing can only be installed together in a current transmission.

The shaft is not machined in the area of the current bearing seat (arrow 1). It can only be installed together with the revised pinion and Torsen differential in current transmissions.





Pinion shaft circlips revised

Beginning with transmission date 03 04 0, the circlip sizes are revised as follows:

Circlip 1

Thickness of circlip
(mm) Part number

2.00 N 902 950.01
2.03 N 902 950.08
2.06 N 902 950.04
2.09 N 902 950.09
2.12 N 902 950.10
2.15 N 902 950.11


Circlip 4

Thickness of circlip
(mm) Part number

1.90 N 902 946.02
1.94 N 902 946.09
1.98 N 902 946.10
2.02 N 902 946.06
2.06 N 902 946.11


Circlip 5

Thickness of circlip
(mm) Part number

1.86 N 902 952.07
1.90 N 902 952.02
1.94 N 902 952.08
1.98 N 902 952.09


Note

The circlips 2, 3, 6 and 7 remain unchanged.

New circlips can be installed in all current transmissions.

Current circlips wiil be deleted when supplies are used up.





Tapered roller bearing circlip, revised

Beginning with transmission date 03 04 0, the circlip sizes are revised as follows:


Thickness of circlip
(mm) Part number

2.00 N 902 942.10
2.03 N 902 942.15
2.06 N 902 942.12
2.09 N 902 942.16
2.12 N 902 942.17
2.15 N 902 942.18





Hollow shaft circlips, revised

Beginning with transmission date 03 04 0, the circlip sizes are revised as follows:

Circlip 3

Thickness of circlip
(mm) Part number

1.90 N 902 946.02
1.94 N 902 946.09
1.98 N 902 946.10
2.02 N 902 946.06
2.06 N 902 946.11


Circlip 4

Thickness of circlip
(mm) Part number

1.86 N 902 952.07
1.90 N 902 952.02
1.94 N 902 952.08
1.98 N 902 952.09
Note

The circlips 1, 2, 5, 6, and 7 remain unchanged.

New circlips can be installed in all current transmissions.

Current circlips will be deleted when supplies are used up.