Need Information. What trans?

There were no overdrive Chrysler built transmissions built in the 70's. If you have an OD Chrysler trans. it has to be alot newer than a 70's model. The identification numbers can be found stamped on main case rail just above the transmission pan mounting surface on the drivers side. There will be 2 sets of numbers there. One is the serial number. The other is the Part number.

Chrysler's OD tranmissions look physically like there 727 and 904 counterparts except their tailshaft extensions are much larger and longer because they contain an overdrive unit.

If you have a way to post a pix here I can tell you what it is. I know them all by sight.