I bought both of these axles since I was unsure of which one I wanted to use. The 14 bolt is from a 1984 P30 RV so it is a c&c axle. Ratio is 4.11 It had 59k miles on it when pulled and still had the leaf springs and airbag set up on it that I have removed now. The dana 80 was from a 1993 p30...