Transmission decoder

Hoping someone out there can help. I'm trying to find out what type of tranny I have on my 1999 durango 5.2 SLT. i want to replace the oil and filter and need to know if it is a 42E,44E or 46E. Of course dodge, in their infinite wisdom keeps this a huge secret. I got the part number off the side of the transmission. It is PK52119817AA but I can't find anything anywhere that will tell me what this part number relates to. I even have the service manual for the car and there is no cross reference chart in there. Anyone out there who can tell me what this part number relates to? Thanks:jerking: