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 that had 40k miles. This is 4.63 ratio and was from a follow axle setup so the casting numbers got covered up and welded on by the mount for next axle. It is a 10x7.5. I plan on setting it up for 8x6.5 if it doesn't sell soon. Both are open diff. I will take 400 a piece or 700 for both. I will take trades on ls engines, th400, 4l80, 205 transfers. Located in middle tn 38581. Text is best 931 808 8700