When I backed it up, after approx 3 ft the drive locked up sharply, as though I had hit something. But I hadn’t, and all 4 wheels were clear. It did the same thing going forward-locking up after just a few feet.I did this several times and the distances prior to lockup seemed the same.I was able to give it a lot of gas and slowly it would move, but something was straining.This afternoon, after completing new starter motor installation, I dropped the driveshaft to have a suspect rear U-joint replaced tomorrow, but I see nothing which looked like it was hitting.On jack stands under the axle, I also am able to rotate both rear wheels in either direction continuously without a lock up. My next step is to remove both rear drums and ensure there are no broken brake springs, but if I don’t see anything there, I have no idea where to look next. There are no unusual noises when I rotate the wheels.Any suggestions?Thanks, MIke Moore300H
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