TrailBeast....thanks for the 904 filter info...now not to open a can of worms, but I was reading about Chrysler ATF fluid and the article said to only use their fluid if you have a lockup TC because their particular formulation is specific to their lockup TC's. I couldn't find a date on the article, but pretty sure they said to use ATF+3 for this application (are they right?)....the article must be old because I don't believe that ATF+3 is available anymore (please correct me if I am wrong).....to make the path even tougher in my eyes is the fact that the PO never told me what type of tranny fluid is in the 1983 lockup 904 and so I have no idea what fluid I should use to keep the tranny operating safely and who's to say that the fluid in there now is the correct stuff for the lockup....and since I can't drain all the fluid out of the TC due to previous drain plug dilemma...(not real keen on the previous post of DIY method of draining TC), I have no idea of what fluid would be backwards compatible (if perchance it is a dexron in there, don't know if that will mix with ATF-3 or updated formulation....probably not because of lockup TC fluid requirements), so no clue what's in there now....feel as though I am really up the creek without a paddle on this one....would be nice if tranny fluid makers color-coded their stuff so I could try to decipher fluid type, but I guess that's not realistic or practical. What are my options at this point in time? fishy68, please chime in as I would be very interested in your thoughts also....man oh man...Also, if there are any other Torqueflite guys out there, would appreciate your response too to get more input on this matter.....Hopefully someone else will add their 2 cents if they had to deal with this same situation....Thanks a bunch, Greg