I hope you didn't drive with the drums off! I can't think of a way to stop in this condition...
Bearings in general make squeals. You are lucky that you can hear a noise when simply turning the wheel since this will make finding it easier.
There are bearings at the end of each axle in the D44, bearings or either side of the carrier inside the diff, and bearings at each end of the pinion shaft. I'm guessing that you can't clearly determine which location the noise comes from so you'll just have to try things.
Noise could be in the drive shaft so be sure you've removed it and still hear the noise.
Next most easy thing is the axle shafts to the wheels. In my D44 these are secured by bolts that hold the brake plates on. Once these bolts are removed the axles pull (or slide hammer) out. There's no clips. I think you have to drain the oil in the diff but I don't know for sure. Pull an axle then turn the yoke. Noise still there? Pull the other axle, noise still there? I hope that one or the other axle is your problem since things get more difficult if the noise is still deeper in the diff.
If the noise doesn't go with the axles, then it's time to pull the carrier. This is not trivial. You might give up at this point and go to a shop. Might as well have a locker or a limited slip tossed in when they disassemble. But if you want to struggle on, hunt this site under my name, mhead, there's a D44 thread that tells of rebuilding. There are other threads that mention D44 as well.
Basically, the carrier is in there tight. It's hard to get it out, it's hard to get it back in. If the carrier bearings or pinion bearings are shot it's hard to get them off and back on, then there's an adjustment that's hard. I had to buy a 20 ton press and build a case spreader to do the work. No problem since I rebuilt the D44 before swapping it under so I had plenty of time. And it took plenty of time.
Maybe you'll get lucky and it's just an axle bearing.