I've seen them go from anywhere around $50 all the way upto $300....especially if it's a posi

....I picked up a front and rear suspension from a 71 for $150???
I'd ask him to pull the cover, take pics of the carrier and ring....he could also jack up the rear, and spin the tires/axles to figure the ratio...if he cannot get a pic of the ratio that's stamped on the ring....let me know if you need pics of the rough location....good luck