[Oldsguy]

First, welcome to our site. Second, I have no experience with your tranny specifically but I would think that probably the detent mechanism that keeps the shifter indicator in position is the culprit. My experience with other atutomatic transmissions is that mechanism is actually in the transmission and not in the steering column. You might check all the linkage from the steering column, down the front of the firewall to the transmission, you may have some unusual loosness or play in one of the joint. Just an idea, hope you get it fixed.