Gear Vendors in 69 Dart

I've had a GV overdrive in a 71 Challenger on a 727. I will be doing an OD transmission for my 68 Roadrunner, but it will be a Passon Hemi OD trans. I don't have much faith in the electronics that operate the GV, after having one.
https://www.passonperformance.com/categories/complete-transmissions/category/86-hemi-overdrive