You guys running A500/518/ 46R etc OD autos..........?
I've had two A518's in my Dart.
Switched OD with a simple 3-way toggle switch.
First one was OD only, took 1 to 2 seconds to engage OD.
The other A518 had OD+LU, but I had installed a TransGo-kit in it. It went into OD and LU quite a bit faster and crisper.
However I toasted the OD-unit with a wrong transmission filter so had to install my first 518 again.
Release is fairly quick.