My first vehicle was a 1997 Ford ranger with the 2.3. Gutless wonder that would hardly do 80 downhill with a tail wind.Actually the 4 L v-6 wasn't very common. The 3 v-6 L was the most common engine. I had a 99 explorer which had 3 engine options. A 4 l ohv v6, a 4 litera sohc v6 and a 5 liter v8. Mine had the 4.0 liter sohc. When I had to get parts many aftermarket providers like pep boys or auto zone were difficult to get parts at, the boxes quite frequently were mismarked. The ranger was similar, but had different options, the 2.3 liter i4, the 3.0 liter v6 and 4.0 liter overhead valve v6. I believe the 4 liter was a 90 degree v6, while the 3 liter was a 60 degree v6, making it more narrow. As suggested, the Vin number is the best way, assuming no one has swapped out the motor. Had a ranger, it had the 4 cylinder, not a bad vehicle and solidly built, got great gas mileage. I may be wrong, but I do not think you could get a manual transmission with the 4 liter v6.