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TSB 21-07-97

Transmission Cooler Reverse Flushing with Cooler Bypass Kit Installed

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Models: 1994 -1997  (BR) Ram Truck,  1989 - 1993 (AD) Ram Pickup

1989 - 1997 (AB) Ram Van/Wagon
1989 - 1993 (AD) Ram Pickup
1989 - 1996 (AN) Dakota
1994 -1997  (BR) Ram Truck
1993 - 1997 (ZJ) Grand Cherokee

NOTE: THIS BULLETIN APPLIES TO VEHICLES WITH GASOLINE ENGINES AND A 42RE, 44RE, 46RE, OR 47RE TRANSMISSION WITH A COOLER BYPASS KIT INSTALLATION.

Discussion:

Whenever reverse flushing is necessary, the bypass valve assembly must be removed from the system prior to performing the procedure. Failure to remove the bypass valve may plug the valves orifice and drainback valve. Plugging of this valve may result in transmission failure. In addition to the above recommendations, the valve and adaptor may require replacement if a transmission failure causes an excess amount of debris to be suspended in the transmission fluid. The bypass valve p/n 04798633 and adaptor p/n 04798634 can be ordered separately from the kit.  

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