Ya they did for 1 year, 1984 when it came out. They found it far to week for fleet trucks and went back to the solid Dana 60 so they could sell them. I Had one, it was a Dana 50 and the one on that truck ain't! It would have the same locking hubs as the Dana 60 and that one has the little hubs. It's not hard to swap one under a 1 ton but the only real difference between a 3/4 and 1 ton is the solid axle, so in essence that would make it a 3/4 ton. Even the spring count and lift blocks are the same on the regular cab 1ton as the 3/4.
The guy is right that it rides better but mine was a tire killer of the first order! Thats why I now have a Dana 60 under it.