A/T - Harsh Gear Engagement
88olds02SUBJECT HARSH ENGAGEMENT CONDITIONS: NUMBER: 88-T-25
I. PARK OR NEUTRAL TO DRIVE OR REVERSE
II. REVERSE TO DRIVE - VEHICLES WITH 2.8L CORP. REF. NO.: 877108
ENGINES ONLY
MODELS/YEARS 1987-1988 VEHICLES EQUIPPED WITH THM DATE: January 1988
440-T4 (ME9) TRANSAXLE
SECTION: 7A
VEHICLE APPLICATIONS
Cutlass Ciera (A Carline), Delta 88 (H Carline), Ninety-Eight (C Carline), Toronado (E Carline), Cutlass Supreme (W Carline)
BULLETIN COVERS:
Harsh Engagement conditions and specfic service information for 1987 and 1988 cars equipped with a THM 440-T4 transaxle. Other items which cause harsh engagement conditions are:
- Vacuum leaks (low vacuum supply to the vacuum modulator) 3346 CM HG (13-18 in hg) required
- Stuck modulator valve
- Missing No. 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 tranaxles were built using a new 1-2 servo cushion spring, reverse servo cushion spring and reverse servo return spring.
FIGURE 2 - 1-2 SERVO AND REVERSE SERVO ASSEMBLIES:
SERVICE ACTION: (Figure 2)
1. Harsh engagement from park or neutral to drive or reverse - 1987-1988 A, C, H, E carlines without 2.8L engines
1. Remove the 1-2 servo assembly and the reverse servo assembly from the transaxle.
2. Disassemble and replace the 1-2 servo cushion spring (559) and the reverse servo cushion spring (549) with the correct part listed in the service parts information section.
3. Install the 1-2 servo assembly and reverse servo assembly in the transaxle.
II. Harsh engagement from reverse to drive, park or neutral to drive or reverse - 1987-1988 A carlines with 2.8L engines only, 1988 W carlines with 2.8L engines only
1. Remove the 1-2 servo assembly and the reverse servo assembly from the transaxle.
2. Disassemble and replace the 1-2 servo cushion spring (559), the reverse servo cushion spring (549) and the reverse servo return spring (552) with the parts listed in the service parts information section.
3. Install the 1-2 servo assembly and reverse servo assembly in the transaxle.
SERVICE PARTS INFORMATION:
Part
Number Description Usage
8668121 Reverse Servo Cushion Spring (549) All 1987-88 Models
8668123 1-2 Servo Cushion Spring (559) All 1987-88 Models
8668127 Reverse Servo Return Spring (552) 1987-88 Vehicles W/
2.8L Engines Only
SERVICE MANUAL REFERENCE:
Refer to the THM 440-T4 (ME9) Automatic Tranaxle On-Car Service section for appropriate service information.
SERVICE NOTES:
For warranty purposes, use applicable labor time and operation numbers.