Gary thanks for the post and answer on the cruise-o-matic operation. Ray perhaps we can pick this thread up and place Gary's post in our technical section...
Jason: If it helps, with the driving speed and amount of miles we put on our 58 & 60 they are always in D2. The others may chime in as well, as to their driving habits.
Dano Calgary,Alberta Canada
58HT #33317 60HT # 23023