This was a BorgWarner OD, and the cable was only a lockout, not a shifter. Shifting was electrical utilizing a governor, solenoid, and a kickdown switch.Joop: my Dad's 50 ford V8 w/overdrive had it cable actuated, You might be able to adapt something like that. I would think for or merc, probably 49-54 or so might work. Hope this helps.
Paul in CT