Anyone know about Lock-up torque converters?

[Aracer]

Anyone know about Lock-up torque converters?

[Joe mama]

What kind of information are you looking for?

[Aracer]

How to identify one by looking in the opening? I was following up on my unanswered previous post? Thanks for asking. And symmetrical bolt patterns on the flex plates. What year did these come out?
 

[Joe mama]

For Mopars lock-up converters have been out since the late 70's. Depending on the converter, if you look into the hub you may be able to see a lip seal or o-ring approx. 3/4" from the front of the converter.
As for external I.D. As far as I know the bolt pattern didn't change but the shape of the front of the converter did. The front side will have a flat area about 2in. wide that is near the outside dia.
What year transmission are you asking about? Maybe someone has pictures for you.

[Aracer]

Thank-you, inside it has an O ring near the bottom. That makes it a Lock-up? It has the splines on the top edge of large sprocket, so that's high stall. Inside is 5 3/4" deep, bottom of crank hub, outside depth is 5 7/8".
      The back side, flexplate lug, area, looks modern, not rounded like the 70's 11" type. (see photo's) The hub side is normal round, with no large weights on the flat band, one tiny balance shim tacked.
     The other difference is the symmetrical bolt pattern.
      Have a new flex plate that can easily be made symmetrical by an drilling an adjacent hole, to the offset one. I used a old plate to mark the new hole.
      The crank hub is new and "centers" the converter for no vibration. So the plate just drives the trans. With some plate wiggle before its bolted in, is normal, correct?       

It looks like 23 splines on the small sprocket. What, used that in 1984?