When my truck is finished with its restoration, I'll let you know how it works. I was able to find a rear end from a 71 3/4 ton w/ 350 and auto transmission. Bought the whole rear end, took it home, and popped out the third member. It was a 4.10. I gave $250 for it. The guy who ran the junkyard specialized in 68-72 chevys. He's ran it for years. He was surprised by the concept.
They do exist, but as it was said before, they won't jump out of the weeds at you. You will have to hunt for them. Watch craigslist for parts trucks.
