Hilux, it is my understanding that the reason for the different connectors is so that you can't swap the solenoid packs easy, IIRC in the earlier setups the circuit protections are built into the solenoid pack, and the newer style the protections are in the ECM - if you put in a new-style pack with an old-style ECM you will have no circuit protections and you may fry something. I do believe tho the opening in the trans case is the same, in which case you should be able to just put in your new solenoid pack in the older-style trans, but there may be some check ***** above the separator plate that should not be there for the new-style pack to work... I'm thinking we need to get Mark Kowalsky to shed some light on this sunject.