Posting this for a fellow Buick friend that is not on the internet. Complete 3.42 posi rear out of a 71 Riveria GS. Has been disassembled, sandblasted, painted, and rebuilt with all new bearings/seals/brakes/wheel cylinders/drums turned. Ready to install. Located in Eastern NC right off I-95 near Rocky Mount. If you are interested, post here and I will PM you his phone number so you can call and talk to him. He is asking $1500, but that is negotiable.
I spoke with him the other day. The price is reduced to $1000, and I'll deliver it to the Nats in Bowling Green for free.