A/T - Slips or No Drive
Number 87-7-15 Date 4/87Subject: SLIP OR NO DRIVE
1987 6000 EQUIPPED WITH THM 440-T4 (ME9) ALL TRANSAXLES MODELS
A slip or no drive condition on a THM 440-T4 transaxle may be caused by low line pressure due to the pump slide binding on excessive casting flash when the slide is in the low pressure position. Modulator vacuum will not affect line pressures if this condition is present. This condition can be repaired by replacing the oil pump assembly.
Figure 1 - THM 440-T4 Transaxle Identification Information:
DATE OF PRODUCTION: (Figure 1)
A THM 440-T4 transaxle built between November 26, 1986 (Julian Date 330) and January 12, 1987 (Julian Date 012) may exhibit this condition..
Figure 2 - OIL PUMP ASSEMBLY:
SERVICE ACTION: (Figure 2)
Remove oil pump cover and pump priming springs and move the slide by hand. If excessive flash is present the slide will bind in the area indicated in Figure 2.
SERVICE PARTS INFORMATION:
Refer to GMSPO Catalog for part number information.
SERVICE MANUAL REFERENCE:
Refer to THM 440-T4 (ME9) Automatic Transaxle Unit Repair Table of Contents for oil pump service information.