if you worked on anything related to the rear end such as brakes,etc. I would recheck that..if you have the entire rear end off the ground and the driveshaft out and the brakes are not stopping it then that leaves nothing except something in the rear end itself such as an axle bearing or something in the chunk itself
Sometimes in salt water air environments the brakes will seize to the drum if the e-brake is left on. This is very common on big rigs as well when parked for more than a few days but I have seen in a number of times in smaller rigs.
If you were not working on anything else on the axle then this is most likely the case. Pull the wheel and see if a few good hits with a BFH brakes it loose.
Politically correctness: The doctrine that holds forth the proposition that it is entirely possible to pick a turn up by the clean end.