That rod just snaps onto that ball....It should snap and hold on there though....It should take a little force to pull it off.....There is supposed to be a metal clip like thing on the end of the rod around hole that clasps around the ball....If somebody epoxied it, it is probably missing.....That is all you need...you can see it in the link to another members picture....It is the middle rod in the picture and it the metal piece at the far left of the picture
http://www.forabodiesonly.com/mopar/showthread.php?t=98477&highlight=kickdown+linkage