At this point, how do you know if ANY of them have been modified?
I think the answer is to take it apart and compare it to the FSM diagrams to look for changes.
If you unbolt it and the accumulator spring is present, it's unmodified. That's the first thing to go in any upgrade. Finding an unmodified valve body should not prove difficult.
Thanks Doc...I assumed 727 and 904 were different...good to know the the PTKD is the same. Once I start driving the coronet again I'll be able to see if I had PTKD in it or not...can't recall now. But I have a couple spare valve bodies in my parts trucks so if it doesn't I now know I can steal the PTKD from one of those.
The entire valve body is the same between them within years and lockup presence (in case I wasn't clear on that).
The following diagram illustrates the location, although prior to 1971 the flat steel plate isn't present on PTKD transmissions (it's simply a closed casting, not flat on the end). A&A used to sell a kit, as did DC/MP. Both dispensed with the flat steel cover plate. Yes, you have to drop the valve body but it's a very-easy mod. Once again, in case I wasn't clear, the PTKD can be installed on any '66-up 727/904. The necessary passages in the valve body are the same and the mounting provisions are there.
This is what the '66-'71 PTKD valve body looks like, with the A&A part being a similarly-shaped billet version:
'71 and later, it looks like this:
Either style does the same thing. I'm not sure why it got more complex during 1971. I'm also not sure if it's a model-year difference or calendar-year rolling change.
huh....i can honestly say ive never driven a mopar WITHOUT ptkd, and the trans in my 67 fish is actualy numbers matching LOL...and its never been rebuilt as far as i can tell its never even been out of the car
The trans
can't be numbers-matching. That didn't start until 1968, and then
only on high-performance engines/models (i.e. a '68 Charger 383-4V should not be stamped). Stamping all engines/transmissions began in 1969. Yours has either been swapped or someone was inside it in the 20+ years prior to your ownership. Only Slant Sixes got PTKD in 1967, and the assembly processes/workflow at the transmission plant would've precluded a "factory error" situation from occurring. That kind of thing only happened on the assembly line.