Originally posted by Joerg Walzenbach:
The OD off switch in the shifter only disables the overdrive (at least in all ATX Mondeos), making 3rd the highest available gear.
HTH
Joerg
The OD Disable button ONLY disables the Torque Converter Clutch.
It does not disable 4th gear.
You will get three upshifts with the OD Disabled.
You just don't get TCC Lockup with 4th gear.