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In vehicles with a five-speed automatic transmission, keeping the gearshift in "D4" will cancel the fifth (or "overdrive") gear keeping the vehicle in fourth gear; this setting is recommended when towing trailers or boats to keep the transmission from overheating.

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Auto transmissionsUse D4 or D with a circle around it (indicating OD for overdrive) almost all the time for best economy and lowest engine wear. There are two exceptions to this. When you are going up a long hill or hauling a heavy load and the transmission keeps shifting in and out of overdrive, it is easier on the vehicle to manually shift it to D3. Also, D3 can be used to slightly slow the vehicle when going downhill - this is called engine braking. Do not forget to shift back into D4 when you are past the hill. D3 always when driving around town after say 55 cruising you should then release the gas slightly and shift to D4 (OD) but don't forget to shift on the highway the extra rpm of running in D3 at higher speeds will burn more gas cause faster engine wear, and also could cause engine to over heat. just a simple answer to your problem.