There have been many revisions to the 4T transmission series as well as the 4L. Most upgrades have been internal, but some could have been to the solenoids, might try seeing if there is the same p# to the 2004 as the 1997?
I am good at cut and paste:
http://action.publicbroadcasting.net...t/2135384.page
I am not shure all the Ventures got the 4T65e, I think some may have had 4T60e's, but does someone know for shure?