1989 PRODUCT UPDATES 1989 THM 440-T4

TRANSMISSION MODELS: VEHICLE APPLICATIONS:

ALL THM 440-T-4/HYDRA- 1989 A,C,E,H,K,W, CARS MATIC 4T60 MODELS 1989 V CAR THM F-7 - AXH

Bulletin Covers:

The Product Information contained in this bulletin describes changes that have occurred on all 1989 THM 440-T4/HYDRA-MATIC 4T60 and THM F-7 transaxles. Refer to each section of this bulletin for specific product change information.

DATE OF PRODUCTION CHANGE: (Figure 1) ------------------------- Refer to each different subject.

SERVICE MANUAL REFERENCE:

This information is an update for 1989 Service Manuals printed prior to December 1, 1988. Use it to update your 1989 Service Manual.

SUBJECT: New Material For Side Cover To Channel Plate Gasket ------- TRANSAXLE APPLICATIONS: ----------------------- 1989 THM 440-T4/HYDRA-MATIC 4T60 (ME9) 1989 THM F-7 (ME9)

TRANSAXLE MODELS: VEHICLE APPLICATIONS ------------------ -------------------- ALL THM 440-T4/HYDRA-MATIC 4T60 MODELS 1989 A, C, E, H, K, W Cars THM F-7 - AXH 1989 V Car

BULLETIN COVERS:

A new Side Cover To Channel Plate Gasket (65) using a new (Vamac(TM)/cork) latex coated cellulose Gasket (Figure 2). The new Gasket will provide a better seal by reducing the potential of crushing or splitting of the Gasket when the Case Side Cover Pan Nuts (53) are torqued.

DATE OF PRODUCTION CHANGE: (Figure 1) -------------------------- November 1, 1988 (Julian Date 306) all THM 440-T4/HYDRA-MATIC 4T60 and THM F-7 transaxles are built with the new Gasket.

SERVICE PARTS INFORMATION:

The new Gasket will be available for service once the previous gasket stock has been used up for service. This new Gasket will not be available separately, order the Side Cover Gasket kit package or the Complete Overhaul Repair package.

Part No. Desc Model Year/Model Usage --------- ------ ---------------------- 8644902 Pkg. Side Cover Gaskets Kit 1984-89/All - Gasket, Side Cover to Case - Gasket, Side Cover to Channel Plate

SUBJECT: New Input Sun Gear To Input Carrier Thrust Bearing Assembly ------- TRANSAXLE APPLICATIONS: ----------------------- 1989 THM 440-T4/HYDRA-MATIC 4T60 (ME9) 1989 THM F-7 (ME9)

TRANSAXLE MODELS: VEHICLE APPLICATIONS: ----------------- --------------------- All THM 440-T4/HYDRA-MATIC 4T60 MODELS 1989 A, C, E, H, K, W Cars THM F-7 - AXH 1989 V Car

BULLETIN COVERS:

A new Input Sun Gear to Input Carrier Thrust Bearing Assembly that has increased torque capacity for higher torque engines. The new Input Sun/Carrier Bearing Assembly (661) is 0.38mm (0.015") thicker and the Input Carrier Assembly (662) Bearing Pocket is machined deeper to accommodate the increased thickness of the new Bearing (Figure 3).

SERVICE ACTION:

The new Input Carrier Assembly (662) will be available for service for all current and past models built after April 1, 1986 (Julian Date 091) (Wider Input Sprag Change).

DATE OF PRODUCTION CHANGE: (Figure 1) -------------------------- November 1, 1988 (Julian Date 306) all THM 440-T4/HYDRA-MATIC 4T60 and THM F-7 transaxles are built with the new Input Sun/Carrier Bearing Assembly (661) and Input Carrier Assembly (662).

SERVICE PARTS INFORMATION:

Part No. Description Model Year/Model Usage -------- ------------ ----------------------- 8668244 Carrier Assembly, Input Complete 1986-89/All (new)

SUBJECT: New Wiring Harness to Prevent Pinched/Shorted Converter Clutch ------- Solenoid Wires

TRANSAXLE APPLICATIONS:

1989 THM 440-T4/HYDRA-MATIC 4T60 (ME9) 1989 THM F-7 (ME9)

TRANSAXLE MODELS: VEHICLE APPLICATIONS: ----------------- --------------------- All THM 440-T4/HYDRA-MATIC 4T60 Models 1989 A, C, E, H, K, W Cars THM F-7 - AXH 1989 V Car

BULLETIN COVERS: (Figures 2, 4, 5, 6 7) ---------------- A revised wire routing for the Torque Converter Clutch or Viscous Converter Clutch Solenoid (TCC or VCC) requires a new Wiring Harness. The TCC or VCC wires are now routed straight down from the Engine Wire Harness Connector to the TCC or VCC Solenoid instead of going around the Oil Pump Body. This reduces the possibility of the TCC or VCC wires becoming pinched/shorted between the Pump Cover and the Case Side Cover Pan during assembly. For this change to occur, a Wire Conduit Clip (TCC or VCC) has been added to secure the Wire Conduit (TCC or VCC).

SERVICE ACTION:

The new Wire Harness will not be available for service except on the THM F-7 AXH model. Order the old style Wire Harness to service present THM 440-T4/HYDRA-MATIC 4T60 models. When using the old style wire harness ensure the routing will not allow the (VCC or TCC) wires to get pinches between the pump cover and case side cover pan during assembly. The new wire harness can service early built 1989 models on the THM F-7 but the new wire conduit clip (VCC) must be used.

DATE OF PRODUCTION CHANGE: (Figure 1) ------------------------- November 1, 1988 (Julian Date 306) all THM 440-T4/HYDRA-MATIC 4T60 and THM F-7 transaxles were built using the Wiring Harness and TCC or VCC Clip.

SERVICE PARTS INFORMATION:

When the supply of old style wire harnesses indicated by the asterisk "*" is depleted the new style wire harness will be available.

Part No. Description Model Year/Model Usage -------- ------------ ---------------------- *8662852 Harness Assembly, Wiring 1989/BHH, BJH, BPH, BWH, PAH *8662324 Harness Assembly, Wiring 1989/BAH, BDH, BFH, BMH, CDH, CLH, CPH, CYJ, CZH *8668099 Harness Assembly, Wiring 1989/AAH, ABH, AFH, AJH, ANH, ATH 8668146 Harness Assembly, Wiring 1989/AXH

8668271 Clip, Wire Conduit (TCC/VCC) 1989/All

*Old style wire harness.

SUBJECT: New Bottom Pan And New Latex Coated Cellulose Gasket ------- TRANSAXLE APPLICATIONS: 1989 THM F-7 (ME9) ---------------------- TRANSAXLE MODELS: THM F-7 - AXH ---------------- VEHICLE APPLICATIONS: V Car --------------------- BULLETIN COVERS: ---------------- A new transaxle bottom pan having a continuous raised rib on the pan rail and new latex coated cellulose gasket (Figure 8). The new pan must be used with the new gasekt and will provide a better seal by reducing the potential of crushing or splitting the gasket when the pan bolts are torqued.

DATE OF PRODUCTION CHANGE: (Figure 1) ------------------------- January 30, 1989 (Julian Date 030) all THM F-7 transaxles are built with the new bottom pan and new gasket.

SERVICE ACTION:

When replacing the bottom pan on all 1987 through 1989 THM F-7 transaxles use the service package listed in the "Service Parts Information" section below. If the previous design pan is used with the new gasket, or the new design pan is used with a cork gasket, fluid leaks may develop.

SERVICE PARTS INFORMATION:

Part No. Description (Contents) -------- ---------------------- 8661917 Transaxle Bottom Pan Package (1) Transaxle bottom pan gasket (latex coated cellulose) (1) Transaxle bottom pan (raised rib) (1) Chip collector magnet

8668028 Transaxle Bottom Pan Gasket (latex coated cellulose)

SERVICE MANUAL REFERENCE:

Refer to the THM F-7 (ME9) Automatic Transaxle Unit Repair Table of Contents for bottom pan and gasket service information. 0231b/31-35

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.