aisin-warner
AW 55-50SN / AF 23-33 Diagnosis and Valve Body Information.pdf
This material is a route past the “thin ice” that other travelers have marked. At these flag’s per say, the test or inspection, frequently points to the valve body, as it accounts for the majority of the transmission’s issues. The 55 50/51 SN is installed into a multitude of vehicles and there will be variations to the unit and this data. A similar valve body will bolt to a GM, Volvo, Saturn, Nissan, Saab, Opel or Renault. Failure to test and recognize can create hours of additional effort.
Aisin-Warner AW-4 Automatic Transmission Service Manual.pdf
AW-4 was built by the famous transmission maker, Aisin Warner and is widely used by various type of Jeep, such as Cherokee XJ, Comanche 2.5L and Comanche 4.0 and Jeep Grand Cherokee 4.0L.

