Thanks for your quick responses. I would like to keep the Dynaflow but want the performance of a newer tranny. Also, there seems to be fewer transmission shops working on Dynaflows in my area(New Orleans if you haven't figured that out yet). I am looking at the long term for future maintenance issues and parts availability. Tim63Riv - Where can I get a THM 400, what additional changes as far as...linkage requirements, possible drive shaft change, console shifter change...etc. do I need to look at? I don't mind spending a few bucks but within reason. I would like to hear from somebody who has made a swap and reply with their experience...good or bad. I am open to "diehard" Dynaflow readers who can convince me to keep the tranny I have. My car is more of a weekend driver, not a show car. Thanks again for your replys! Gary