If you have cruise control(?) your early A442F box will have a solenoid for OD which the CC ECU can use to turn off OD when it needs to. Otherwise, as Dave mentioned, there are things you can fiddle with on the valve body but they are all hydraulic apart from the CC OD solenoid if it has CC.
RM314E & RM315E document the later version of the A442F with the ECU controlled valve body not the earlier hydraulic valve body version.
The A440F wasn't fitted to 80's with the 1HD-T.