early 98s where 12v engines. 98.5 they went to the 24 valve vp44 injected trucks and ran that body style in the 2500 and 3500 through 02. I was kinda spooked about the very expensive VP pump. If you get one make sure to get service records! Other than that they are excellent trucks, interior leaves a bit to desired, also the automatic trans in stock form, but the engine is CUMMINS solid and will run forever! No more gas truck for this guy..Besides my jeep has a L6, why cant its tow rig?