A/T - THM 440-T4 Service Manual Update
88buick01Bulletin 87-7440-11
Date Jan., '88
Ref. No. 87-211-7440
Corp. Ref. No. 777148
SUBJECT: SERVICE MANUAL UPDATE INFORMATION
MODELS AFFECTED: ALL 1986-87 VEHICLES EQUIPPED WITH THM 440-T4 (ME9) TRANSAXLES
FIGURE 3 - TRANSAXLE INTERNAL COMPONENTS:
FIGURE 4 - SHIFT SPEED CHART:
FIGURE 5 - NEW THERMAL ELEMENT PIN HEIGHT GAUGE J 34094-A:
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).
FIGURE 1 - 1986 PRELIMINARY CHECK PROCEDURE:
FIGURE 2 - 1987 PRELIMINARY CHECK PROCEDURE:
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