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If the TCM is integrated into the valve body it will not work. They changed mid year 04 (from separate TCM in the passenger side footwell, to an integrated TCM inside the VB). I think you'd have to update the ECM also if you wanted to use a new version of the TCM (and do some rewiring or get a new harness also).
MIne is an 03 with the TCM in the footwell . I'll have to ask the guy that has the 04 tranny .
Jeff
I have a VB upgrade / Higher stall trq converter , and really dont like it any more . I no longer have the blower on the car and would rather have a smooth tranny
Then I think you're going to be stuck searching for another 03. I believe they changed all the trannys to the internal TCM type. But check the model numbers anyway.