Thanks for this Buick transmission history.
selmslie wrote:
Notice the order of the gears - P N D L R - a disastrous arrangement if you tried to downshift to slow the car down. I did it once in a 1952 Special. The wheels locked up and spun the car. The torque converter did not last long after that. Buick subsequently changed to P R N D L before they finally gave up on Dynaflow.