The updatable TCM came about in 1994. It can be recognized by heat sink fins on its housing. You need one of these to start out with.
Previous TCMs were smooth sided housings and basically throw-away.
Look on the finned TCM for a Chrysler 'Authorized software update' sticker or underhood for the 'Authorized vehicle modification' sticker. These may or may not be there. Not having the stickers present, doesn't mean that the updates haven't been done over the life of the vehicle.
A DRB or other good scan tool that can read the internal TCM part # electrically will let you know if you have the latest and greatest software in your TCM. It really can make a big difference in shift/drive behavior.
See Chrysler TSB # 18-24-95 for the update specifics. It covered 1989-1995 A-604/41TE/42LE transaxle control modules. The minivan is an AS body. A dealer should be able to check and perform the bulletin.
2010-11-03_173758_18-24-95-2.doc
Previous TCMs were smooth sided housings and basically throw-away.
Look on the finned TCM for a Chrysler 'Authorized software update' sticker or underhood for the 'Authorized vehicle modification' sticker. These may or may not be there. Not having the stickers present, doesn't mean that the updates haven't been done over the life of the vehicle.
A DRB or other good scan tool that can read the internal TCM part # electrically will let you know if you have the latest and greatest software in your TCM. It really can make a big difference in shift/drive behavior.
See Chrysler TSB # 18-24-95 for the update specifics. It covered 1989-1995 A-604/41TE/42LE transaxle control modules. The minivan is an AS body. A dealer should be able to check and perform the bulletin.
2010-11-03_173758_18-24-95-2.doc