10 Plate 3RD Clutch Pack
FIGURE 5 - 3RD CLUTCH PLATE ASSEMBLY:
FIGURE 6 - INPUT CLUTCH PISTON:
FIGURE 7 - 3RD CLUTCH PISTON HOUSING ASSEMBLY:
FIGURE 8 - 3RD CLUTCH PISTON SEAL ASSEMBLY AND RETAINER & BALL ASSEMBLY:
FIGURE 9 - 3RD ROLLER CLUTCH RACE:
FIGURE 10 - 3RD CLUTCH SPRING RETAINER & GUIDE ASSEMBLY:
TRANSAXLE APPLICATIONS: SUBJECT:
1989 THM 440-T4 (ME9) 10 Plate 3rd Clutch Pack
1989 THM F-7 (ME9)
TRANSAXLE MODELS: VEHICLE APPLICATIONS:
All THM 440-T4 A, C, H, E, K, W, Z Cars
THM F-7 - AXH V Car
CHANGE TO ASSEMBLY COMPONENT: (Figures 4, 5, 6, 7, 8, 9 and 10)
A new 10 plate 3rd clutch pack (640) is used to replace the 8 plate 3rd clutch pack for all 1989 THM 440-T4 and THM F-7 transaxles. The two extra plates were added for new higher torque engine applications.
FIGURE 5 - 3RD CLUTCH PLATE ASSEMBLY:
For this change to be implemented the following parts were modified:
- 3rd clutch plate (fiber one side) I.D. and O.D. splines, (Figure 5) are thinner by 0.15 mm (0.006"). The fiber material is the same thickness only the steel part of the plate was made thinner.
FIGURE 6 - INPUT CLUTCH PISTON:
- Input clutch piston (630) cutouts for the 3rd clutch plates are 6.35 mm (0.25") deeper so the piston travel will clear the increased thickness of the 3rd clutch plate pack. (Figure 6)
FIGURE 7 - 3RD CLUTCH PISTON HOUSING ASSEMBLY:
- 3rd clutch piston housing (633) has decreased in overall size. (Figure 7)
FIGURE 8 - 3RD CLUTCH PISTON SEAL ASSEMBLY AND RETAINER & BALL ASSEMBLY:
- 3rd clutch piston (637) seal (635) is now molded to the piston (802) (Figure 8).
FIGURE 9 - 3RD ROLLER CLUTCH RACE:
- 3rd roller clutch outer race (645) is wider by 0.83 mm (0.033") to accommodate the two extra plates. (Figure 9)
Note: The rollers have not changed in width.
FIGURE 10 - 3RD CLUTCH SPRING RETAINER & GUIDE ASSEMBLY:
- 3rd clutch spring retainer and guide assembly (638) cutout is 1.1 mm (0.043") deeper for 1989. This allows sufficient clearance for the relocated retainer and ball assembly that is part of the new 3rd clutch piston seal assembly and retainer and ball assembly (802). (Figure 10)
FIGURE 5 - 3RD CLUTCH PLATE ASSEMBLY:
FIGURE 6 - INPUT CLUTCH PISTON:
FIGURE 7 - 3RD CLUTCH PISTON HOUSING ASSEMBLY:
FIGURE 8 - 3RD CLUTCH PISTON SEAL ASSEMBLY AND RETAINER & BALL ASSEMBLY:
FIGURE 9 - 3RD ROLLER CLUTCH RACE:
FIGURE 10 - 3RD CLUTCH SPRING RETAINER & GUIDE ASSEMBLY:
SERVICE ACTION:
When servicing a 1984 through 1988 THM 440-T4 or THM F-7 transaxle you must use the previous 3rd clutch pack assembly as shown in the Service Parts Information section below. DO NOT interchange individual components with previous model years or a misbuild will occur. The 1989 input clutch apply piston assembly (630) and 1989 3rd clutch spring retainer and guide assembly (638) are the only components of the 10 plate 3rd clutch pack that can service prior model years.
SERVICE PARTS INFORMATION:
Part No. Description Model Yr - Model Usage
8662927 Plates, 3rd Clutch (fiber 1988 8AAH, 8ABH, 8AFH,
one side with wave plate) 8AJH, 8ANH, 8ATH,
(8 plates) (640) 8CFH, 8CMH, 8GRH,
8CTH, 8CWH, 8CXH
8646938 Plates, 3rd Clutch (fiber 1987-88 All 87 models,
one side) (8 plates) (640) 8BJH, 8BKH, 8BRH,
8BTH, 8BYH, 8FBH,
8FCH, 8FJH, 8FSH,
8VXH
8662954 Plates, 3rd Clutch (fiber 1989 - All Models
one side with wave plate)
(10 plates) (640)
Parts (listed above) are currently available from GMSPO.
8668295 Piston Asm. Input Clutch 1984-89 All Models
Apply (630)
Parts are expected to be available (for part number 8668295). on 10/24/88. Until then normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be cancelled as incorrectly ordered while the 400 control is in place.
8656310 Housing, 3rd Clutch 1984-88 All Models
Piston (633)
8668359 Housing, 3rd Clutch 1989 All Models
Piston (633)
8644919 Piston, 3rd Clutch (637) 1984-88 All Models
8668453 Seal Asm. and Retainer and 1989 All Models
Ball Asm., 3rd Clutch Piston (802)
8662676 Roller Asm. Comp. - 3rd 1984-88 All Models
Clutch (645)
8668367 Roller Asm. Comp. - 3rd 1989 All Models
Clutch (645)
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 and THM F-7 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 or a THM F-7. The wave plate (640A) for 1988 was only used on vehicles equipped with 2.8L, 4.1L or 4.5L engines.