No, you saw a locknut/bolt thingy.
Did you get those books yet? That's the first step before taking things apart.

Sorry, I don't aim to sound pissy, but taking things apart before you have at least a basic understanding of what you're doing is a fast way to cost money and break cars.

Welcome on the board. Your transmission is an A904. A band-and-linkage adjustment will probably make the shift engagement more consistent, and a fluid and filter change will also help (newer fluid is much better than old fluid, just on a formula/performance basis -- not to mention the degradation that comes with fluid age).

For fluid, use Chrysler ATF+4 or a reputable brand of Dexron-VI. Save yourself a great deal of trouble and go to the dealer for a rigid pan gasket part number 4295 875AC (may have superseded to -AD, or -AE, etc.; that's fine).