I am not sure, but, isn't Chrysler product transmission torque converters the ones that have the crazy 3 step way of installing?
something like slide it on the shaft, rotate until it slides forward, rotate again until it goes all the way in, then use a open end wrench to hold it in place & use vice grips or some tool to hold the wrench?
READ THIS!! i believe it is your answer, by the way, did you replace the front seal in the transmission, if you do it now, you won't have to do this all over again in the future?
the main part reads
To install the new seal, press it into the housing and gently tap it home with a hammer. Use a seal driver or a really large socket if possible; otherwise just be really careful to not let it get cocked in the bore. Press it in small stages.
Back to the front: slide the new torque converter onto the shaft. The outermost part of the converter should sit about half an inch into the bellhousing -- use a straightedge and measure it if you're not sure. It'll slip on the first part without effort, but may require some twisting and pushing to seat fully. Get this correct now, because you'll be doing it again later if you mess up.
Use a pair of small C-clamps or Vise-Grips to brace the converter in position. Hint: if you can't do this because there's not enough bellhousing lip in front of the converter, then the converter's not fully seated.
On the engine, unbolt the flexplate. It's held on by six 3/4" bolts. Install the new flexplate and torque down to 55 ft-lb. Odds are, both operations will require an assistant holding the crank nut with a breaker bar.
Coat the crankshaft's hub detent with grease.
Wheel that tranny back under the truck and raise it to near engine level. The engine has two dowel pins pressed in it; these fit into corresponding holes in the transmission bellhousing. Push the transmission up against the engine so that the pins guide it into place. This could take some serious coaxing, but eventually it'll work. When it does, thread one bolt on each side to hold the transmission in position.