Celebrity V6-173 2.8L (1989)
Seals and Gaskets: All Technical Service Bulletins
A/T - Intermittent Slip In Forward/Reverse When Cold
Number:
89-30-7A
Section:
7A
Date:
NOV., 1988
Subject:
INTERMITTENT SLIP IN FORWARD AND/OR REVERSE WHEN COLD
Model and Year:
1989 CELEBRITY WITH THM-440-T4 (HMD 4T60) TRANSAXLE
TO:
ALL CHEVROLET DEALERS
An intermittent slip in forward and/or reverse may occur in the above referenced vehicle when the transaxle is cold. This may be caused by leaking Input
Shaft Oil Seal Ring(s) (624) and can be due to one or more undersized Input Shaft Oil Seal Ring(s) that seal the Input Clutch and 3rd Clutch feed holes.
The transaxle may slip less in Reverse or Manual Lo (D1) ranges (due to boosted line pressure) than in Overdrive (D4), Drive (D3), or Manual Second
(D2).
FIGURE 2 - INPUT SHAFT OIL SEAL RINGS
SERVICE ACTION:
(Figure 2)
Disassemble the transaxle, remove the Shaft and Housing Assembly (626) and inspect the Input Shaft Oil Seal Rings (624) while in the grooves. The
rings should take up most of the groove width. If the ring(s) only take up about half of the groove width then replace them with rings from the package
listed under Service Parts Information. Follow procedures outlined in the 1989 Service Manual Unit Repair section.
Important:
Inspect for burned Input and 3rd Clutch Plate Assemblies. Replace if necessary.
FIGURE 1 - THM 440-T4 TRANSAXLE IDENTIFICATION INFORMATION
SERVICE PARTS INFORMATION:
