727 Locked up while driving causes?

Shutting off the engine and putting the shifter in neutral did nothing to unlock the rear tires, so it got removed. turning the engine by hand at the harmonic balancer while in gears causes the remaining upper ujoint and shaft coming out of the transmission to move. I did not want to run the car in gear with the drive shaft out , but i assumed if it would spin by hand then I would be fine. Bret

Ok, but in your first post you also said

It seems to shift through the gears fine now, and the engine turns freely both in drive , neutral and reverse, along with the transmission.

Am I reading that right that apparently you re-installed the driveshaft and it now works?

No, don't run it through the gears without a driveshaft in it.