Volvo 740 1989 Owner's Maintenance Manual page 63

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1989 Volvo 740
pg. 53 Manual transmission + overdrive
Gear lever
Depress the clutch fully when shifting gears, and when engaging/disengaging overdrive (5th gear).
Remove foot from the clutch pedal after shifting.
Overdrive (5th gear)
The overdrive can be engaged in 4th gear only the overdrive is engaged/disengaged by depressing the
switch on top of the gear shift lever.
The overdrive is automatically disengaged when downshifting from 4th gear, but you should always
disengage the overdrive manually before downshifting.
To improve mileage it is recommended to use the overdrive as much as possible at speeds above 45 mph
(70 km/h).
The green control light "5" on the dashboard lights when the overdrive is engaged. See "Shift indicator