As of the below VIN's, the seal and guide tube were modified:

914ES121832 - Coupe 91XES161758 - Targa 918ES170968 - Cabriolet
Parts Information:

OLD NEW

999.113.283.40 - Seal 999.113.327.40 - Seal
915.116.087.03 - Guide Tube 915.116.087.04 - Guide Tube

The new seal has an additional dust lip (arrow) and its location in the guide tube has been moved 10 mm to assure proper alignment with the shaft.

FIGURE 2:

In case of repair, you should be aware of the following:

- Only the new seal is available
- The new guide tube can be installed in all older models including M.Y. 1976.
- The main shaft with shorter sealing surface were factory installed on transmissions up to M.Y 1976 (Fig. 2)
- Transmissions as of Model Year 1976 could be field repaired using a main shaft with a shorter sealing surface.

FIGURE 2:

FIGURE 3:

Therefore, it is very important to measure the sealing surface (Fig. 2 and 3) before guide tube replacement.
I - Old version mainshaft II - New version mainshaft

FIGURE 4:

Important

Due to the different location of the seal in the guide tube, the installation tool has been modified (was P381, now P381a).
Installation Instructions

FIGURE 5:

The old seal installation tool P381 must be used for the old version tube (40 mm) and P381a only for the new version (50 mm)

FIGURE 6:

Since P381a has a guide tube for the oil seal, the guide sleeve should be held in a vise during the seal installation (Fig. 6) and not on a flat surface.

Coordination of Parts
Note: Before installation of the guide tube/seal into transmission, fill seal between the two lips with chassis grease.

The seal of the guide tube is the same as before, with O-ring, Part #999.701.359.40

A/T - Modified Mainshaft Seal and Guide Tube

FIGURE 2:

FIGURE 2:

FIGURE 3:

FIGURE 4:

FIGURE 5:

FIGURE 6: