[A Cobra guy]

Pete,
My ratchet shifter is from B&M. It is there low end unit, the model escapes me at the momnet.
2 ways to use it. Put it drive like any automatic and leave it there.

Or.... Once in drive (3rd position)push back on the lever once and it drops to the 2nd position. Push back again and it drops to 1st position.
Just the reverse for upshifting. Start in the 1st position, when you want to upshift just push the shifter forward once and in goes up a position. And push forward again for 3rd position.
I say position instead of gear because the Lentec AOD is 4 speeds but the shifter has 3 positions. Overdrive(4th gear) can be locked out with a swith. I have mine mounted on the dash with a light to remind me when overdrive is locked out.
It is a great combination. You'll love it.
I was able to mount the shifter very low on the console and with a round ball shifter knob it looks natural in the car. You can see it in the dashboard shot of my car (Click the camera next to my name)