One Piece Channel Plate Gasket

8662674 Spring Retainer and Guide 1984-88 All Models
Asm. - 3rd Clutch

8668071 Spring Retainer and Guide 1984-89 All Models
Asm. - 3rd Clutch

Parts are currently available from GMSPO.

SERVICE MANUAL REFERENCE

This product change information is shown in the THM 440-T4 Automatic Transaxle Unit Repair section of your 1989 Service Manual.

SERVICE NOTES

The 3rd clutch wave plate (800) (was 640A for 1988) is standard on all 1989 vehicles equipped with a THM 440-T4. The wave plate (640A) for 1988 was only used on vehicles equipped with 2.8L.

TRANSAXLE APPLICATIONS SUBJECT:

1989 THM 440-T4 (ME9) One Piece Channel Plate Gasket

TRANSAXLE MODELS: VEHICLE APPLICATIONS:

All THM 440-T4 A, C, H, E, W, Cars

FIGURE 10 - MODULATOR PORT AND CHANNEL PLATE (UPPER) GASKET:

CHANGE TO ASSEMBLY COMPONENTS (Figure 10)

A new one piece channel plate (upper) gasket (801) is used to replace the channel plate (upper) gasket (409) and modulator port gasket (415). The one piece design ensures that the gasket does not become mispositioned upon assembly of the channel plate.
SERVICE ACTION

When servicing a past model (built after 1985-1/2) use the new one piece channel plate (upper) gasket. The one piece channel plate (upper) gasket will service all past models back to 1985-1/2. Transaxles built before 1985-1/2 must still use the two piece channel plate gasket.


NOTICE: The new one piece channel plate gasket cannot be used to service transaxles built before Julian Date 011 for 1985 models. If the new gasket is used on a previous channel plate, park, reverse and neutral (PRN) fluid may enter the reverse servo feed circuit and apply the reverse band. Since the input clutch is applied in Park, the transaxle may be in Park and Reverse at the same time when Park is selected.