That would depend on how fast you are driving , what the rear end gear
ratio is etc.
overdrive ( the overdrive gear of the transmission that allows the engine to run at a slower RPM when you are on the highway )
Overdrive is an extra gear assembly in your transmission that allows the engine to run at a lower RPM when you are on the highway/freeway. It helps improve the gas mileage (Helpfull)
For a 2001 Ford Ranger , 3.0 L " Vulcan " V6 engine : I believe that is rated at ( 150 horsepower at 4750 RPM )
146 ft-lbs at 3000 RPM ( and 119 horsepower at 5000 RPM ) according to the ranger station . com for the 2001 Ford Ranger 2.5 L - SOHC - 4 cylinder engine
The Ranger Station . com ( no spaces ) shows the 2000 and 2001 Ford Ranger 3. 0 L as 150 horsepower @ 4750 RPM and 190 ft/lbs torque @ 3650 RPM
Overdrive should be used when you're pulling a trailer or extra weight in the bed. At a lower RPM there is more torque, therefore more pulling power.
I'm not a mechanic / technician but I BELIEVE that is ( 40 to 60 PSI at 2,000 RPM ) for the oil pressure on a 3.0 liter V6 engine in a Ford Ranger
overdrive allows the engine to run at lower RPM's , which increases the fuel economy and also the transmission runs cooler
i dont go above 5000 rpm for my 1999 ranger 3.0 v6 if that helps?
It's roughly 5500 rpm
For a 2005 Ford Ranger , 3.0 litre " Vulcan " V6 engine : ( 148 horsepower at 4900 RPM and 180 ft/lbs torque at 3950 RPM )
According to ( the ranger station . com ) no spaces - technical library The 1994 Ford Ranger 3.0 L - V6 engine is rated at : 145 horsepower at 4800 RPM and 165 ft-lbs torque at 3600 RPM