A/T - No Third Gear Operation

90cadillac07
Bulletin No. T-90-65
File in Group 7
Number 218
Corp. Ref. No. 077111R
Date MAY, 1990
SUBJECT: NO THIRD GEAR - NEW OUTPUT SHAFT/BEARING AND THIRD ROLLER CLUTCH ASSEMBLY - HYDRA-MATIC 4L60 (THM 440-T4)

MODELS AFFECTED: 1988-1990 DE VFLLES, FLEETWOODS, ELDORADOS, AND SEVILLES


Some 1988-1990 DeVilles, Fleetwoods, Eldorados, and Sevilles may experience a condition of no third gear due to overheating of the third roller clutch and input sprag assemblies during overrun operation. New output shaft/bearing and third roller clutch assemblies are now available for service for certain 1988-1990 vehicles.

Figure 1 - Previous and New Output Shaft/Bearing:

Figure 2 - Third Roller Clutch Outer Race:

Parts Description (Refer to Figures 1 and 2):

^ The new output shaft bearing has a single row or needle bearings instead of a double row to improve oil flow to the third roller clutch input sprag assemblies.

^ The third roller clutch outer race has four less lube holes to keep the roller edges from dipping into the lube hole when overrunning.
Production Change Dates:

^ The new third roller clutch assembly went into production December 11, 1989 (Julian Date 345).

^ The new output shaft/bearing went into production January 25, 1990 (Julian Date 025).


Service Notes:

^ The new parts will assemble the same way as the previous parts.






Service Parts Information:

^ The new output shaft and bearing will service 1988-1990 models.

^ The new third roller clutch assembly will service 1989 and 1990 models back to 1988 Julian Date 333 or any vehicles that have been equipped with an input housing thrust bearing assembly. Refer to Cadillac Service Bulletin T-90-42.