Bonneville V6-231 3.8L VIN 3 SFI (1988)
Valve Body: Customer Interest
A/T - Harsh Engagement
Bulletin Number:
88-7-7
Reference Number:
877108
Publish Date:
12/87
HARSH ENGAGEMENT CONDITIONS:
Subject:
I. PARK OR NEUTRAL TO DRIVE OR REVERSE II. REVERSE TO DRIVE - VEHICLES WITH 2.8L ENGINES ONLY
Models 1987-88 6000, BONNEVILLE AND GRAND PRIX
Affected:
EQUIPPED WITH THM 440-T4 (ME9)
BULLETIN COVERS:
Harsh engagement conditions and specific service information for 1987- 88 models equipped with a THM 440-T4 transaxle.. Other items which cause
harsh engagement conditions are:
-
vacuum leaks (low vacuum supply to the vacuum modulator) 33-46 Cm Hg (13-18 In Hg) required
-
stuck modulator valve
-
missing #9 checkball
Figure 1 - THM 440-T4 Transaxle Identification Information
DATE OF PRODUCTION CHANGE:
(Figure 1)
November 24, 1987 (Julian Date 328), all THM 440-T4 transaxles were built using a new 1-2 servo cushion spring, reverse servo cushion spring and
reverse servo return spring.