Hi I am wanting to change my 91 Chevy silverado 1500 over to a posi. I was wondring if anyone knows what the vin code for this is. does anyone know if it would be cheaper to put in a auburn clutch assembly or to just find a posi. how hard is it to find on of these axles in the junkyard and the such. thanks for any advice. also my axle has this stamped on it i was wondering if you can tell me what it means. pdc k227 1