Most likely a 5.9 liter cummins turbo diesel 12v
if the engine is stock it has 160 horsepower
Yes
The radiator drain plug on a 2001 Dodge Ram 3500 pickup truck with a 5.9 liter diesel engine is on the bottom inside corner of the radiator. It is on the driver's side.
Dodge. Straight up.
94-98.5 dodge cummins 12 valve
Considering that a diesel pickup truck can't use gas I would say that there aren't any diesel trucks that get good gas mileage. If you were wondering which diesel truck gets the highest miles per gallon then I would say you should look at the Dodge Cummins diesel.
If, by ECU you mean "Engine Control Unit", I don't believe a 1968 dodge pickup had one.
If its a gas engine yes, if its a diesel no.
The engine computer is the regulator.
It is on the driver side of the engine block.
One good brand of pickup trucks that is diesel powered is Ram. They are releasing the 2014 Ram 1500 EcoDiesel pickup truck that will be diesel powered.
The "Dodge" diesel is actually a Cummins heavy truck engine. With proper maintenance, it should last about 250,000 miles. The injectors will need replacing every 100,000 miles.