Hey TrailBeast, if you get a chance watch this video. It's a megashifter in a 87 Trans Am with OD. There are no details about install but it lead me to believe I could do something similar. You'll see the ratchet accounts for 4 gears. But I bet an 87 was pre computer controlled trans.
1995 was the last year of Chrysler hydraulic controlled.
The RH and RE both are electrically controlled OD and lockup, so the physical 4th position in the video doesn't apply to the Chrysler OD trans.