Not really a tech question... Anyone know the difference? I thought it was like the Chev C/K designation, but apparently there are 2wd and 4wd D150 and W150's, then I thought the W's were diesel, but I see there are gas and diesel W's... I found a 4wd 89 W250 with 72k miles for $1500. I thought the W meant diesel, so I was ready to go buy it tonight... So anyone know?