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# SERVICE MANUAL UPDATE INFORMATION/ THM 440-T4

TRANSMISSION APPLICATIONS: SUBJECT: ------------------------- ------- 1986 AND 1987 THM 440-T4 SERVICE MANUAL UPDATE INFORMATION (ME9)

TRANSMISSION MODELS: VEHICLE APPLICATIONS: ------------------- -------------------- ALL MODELS A, C, H, E, K CARS

#### BULLETIN COVERS:

Updates to Service Manual information in the 1986 440-T4 Automatic Transaxle Unit Repair Section and 1987 440-T4 Automatic Transaxle Hydraulic Diagnosis and Unit Repair Sections.

Update the figures in your 1986 and 1987 Service Manuals with the revisions provided in this bulletin (refer to the chart below).

#### SERVICE NOTES:

When checking line pressures on a THM 440-T4 transaxle it is important to follow the steps as described in the Preliminary Check Procedure in Figures 1 and 2. Using the T.V. cable to check maximum line pressures will not provide accurate readings.

Revised Service Manual Information Bulletin Figure Figure Number Model Year Section Page Number -------- ---------- ------- ----- ------ 1 1986 7A1 - Transaxle Unit Repair 440-T4-5 4

2 1987 7A - Hydraulic Diagnosis 440-T4-4 3

3 1987 7A1 - Transaxle Unit Repair 440-T4-14 34

4 1987 7A - Hydraulic Diagnosis 440-T4-3 2

5 1986 7A1 - Transaxle Unit Repair 440-T4-69 79

5 1987 7A1 - Transaxle Unit Repair 440-T4-52 79

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.