The AOD never had the switch on the dash to de-activate the overdrive gear; that would have been one of the newer computer-controlled automatic overdrive transmissions.

The overdrive on the AOD could only be de-activated by the gear selector on the column. The column on the AOD would have been set up like this: P R N OD D 1. The OD would be the overdrive gear of course, and the D would be the overdrive lockout position. The earliest models would have had P R N OD 3 1.