Had an LdN overdrive in my Austin Healey. One of the idiosyncrasies was that at high speed it wouldn't stay in overdrive and you'd be treated to a sudden jump in RPMs when you got up over a hundred. The only answer was to not go fast enough to make it kick out.
KS
Reminds me of an adventure I had at Ford. I was logging data on a test car with the first electronically controlled automatic transmission built by the company. The boss advised me to be be careful because the car had cost three million dollars to build (!). He also mentioned that there might be a few software glitches.
Well, I discovered one of those glitches while traveling down the Southfield Freeway at 70 mph. The thing shifted from fourth to first gear with no warning
After getting the car onto the shoulder and pulling my boxers back out of my butt, I looked around for any spare parts. No problem! I fired up the car and drove back to the office a bit more gingerly. The software guys fixed the "bug".
I also got to experience a bug in the ABS system on an '89 Continental test car. Coming back from a meeting across town, as I pulled into the office parking spot the pedal went full hard - ABS kicking. No brakes
Fortunately the car just bounced back off the curb and I slammed it into Park. Live to fight another day, and file another software bug report...