6000 V6-191 3.1L (1989)
Figure 4 - Service Channel Plate
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New channel plate (404) will have porting changes for the new manual valve and new inside detent lever. The porting changes will help ensure
that two ports will never be opened at once to cause distress to the 4th clutch assembly when the shift cable is not set correctly or is kinked or
binding. The bore for the new manual valve will be reduced to accommodate the manual valve. This will make the new and previous parts
non-interchangeable. The new manual valve and inside detent lever must be used with the new service channel plate. Only the new service
channel plate will be available for 1985-1/2 through 1990 models.
NOTICE:
The new service channel plate assembly must be used with the new manual valve and new detent lever. Using the previous inside
detent lever and the new service channel plate or the new inside detent lever and the previous channel plate will cause durability
concerns.
DATE OF PRODUCTION CHANGE:
Suspect HYDRA-MATIC 4T60 (THM 440-T4) and THM F-7 transaxles were built from January 2, 1989 (Julian Date 002) through January 15, 1990
(Julian Date 016) with the "E" channel plate shown in figure 4.
On January 16, 1990 (Julian Date 016) a new channel plate, manual valve and inside detent lever will be used in production that incorporate all the
changes listed in this Service Bulletin. The new channel plate for production will not have an input accumulator bore (the service channel plate will still
have the input accumulator bore). A wave plate and extra input clutch plate will be added to the input housing input clutch that will replace the function
of the input accumulator. These changes will be addressed in another Service Bulletin.
Service Procedure:
Order service parts from the "Service Parts Information" section of this bulletin. Also, check and/or correct the items listed below:
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Other conditions known to cause 4th clutch distress also include: damaged 3-4 accumulator piston seal, loose channel plate torx head bolt
(72), leaking driven sprocket, 4th clutch piston seals or missing # 1 check ball from a previous repair or leaking # 5 check ball.
NOTICE:
When repair of a distressed 4th clutch has been completed, it is essential to inspect and set the shift cable according to the procedures
as outlined in the transaxle on-vehicle service section of the appropriate service manual. To ensure proper cable set, place the driver
lever (shift lever inside the passenger compartment) against the reverse side of the neutral gate in the column or console prior to
setting the cable at the transaxle.
SERVICE NOTES:
The manual valve link (401) and rod end retaining spring (manual valve) (402) have not been revised for this change.
SERVICE PARTS INFORMATION:
IMPORTANT:
If the previous channel plate assembly is ordered for a 1985-1/2 through 1990 model, the order will be superseded to a new
service channel plate assembly package that will service the transaxle model. A 1985-1/2 through early 1986 models will
require the slot for the inside detent lever to assemble the manual valve link. Order package 8668991 that will contain a
new manual valve link that will assemble to the new inside detent lever.
The new service channel plate assembly packages will contain:
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Channel plate assembly
