A/T - THM 440-T4 Service Manual Update
87chevy25Number: 87-261-7A
Section: 7A
Date: JAN., 1988
Subject: SERVICE MANUAL UPDATE INFORMATION - THM 440-T4
Model and Year: 1986-87 CELEBRITY WITH THM 440-T4 TRANSAXLE
TO: ALL CHEVROLET DEALERS
This bulletin provides updates to the 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.
FIGURE 1 - 1986 PRELIMINARY CHECK PROCEDURE:
FIGURE 2 - 1987 PRELIMINARY CHECK PROCEDURE:
FIGURE 3 - TRANSAXLE INTERNAL COMPONENTS:
FIGURE 4 - SHIFT SPEED CHART:
FIGURE 5 - NEW THERMAL ELEMENT PIN HEIGHT GAGE J 34094-A:
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 MODEL FIGURE
NUMBER 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