Rear Wheels Locked

[deputymarshall]

So...1992 LSL 135k.

For 5k miles has had a weird howl/moan from the driveline. It has seemed like the noise comes from the rear right corner or center of the car.

PO replaced both rear wheel bearings. Didn't address noise.

I bought new wheels/tires...that helped for some reason...but still a noise.

I replaced rear differential with low mileage used about 40 miles ago. Noise still there. I also did calipers and rotors and pads 40 miles ago.

5 miles ago the harmonic dampener/crank pulley went. I replaced that and accessory belts.

Last time I drove it, 1 1/2 miles from my house the brake light went on. 3/10's of a mile further on...I stopped for a redlight in traffic. When I put my foot on the accelerator the car would not move.

I tried reverse. Wouldn't move. I tried putting it in neutral and pushing it...wouldn't move.

I was blocking traffic, so I just gave it some gas to move it about 20 feet to the side of the road. Front wheels dug in and dragged the rear of the car...leaving skid marks from the rear wheels.

The rear wheels are locked up.

I released and jiggled the parking/emergency brake...didn't have any impact.

The rear wheels move several inches and rock back and forth (meaning the calipers are not locked up).

I tried putting in the FWD limp home fuse. No change.

Had it towed...

Seems like the emergency/parking brake has frozen in some catastrophic way...or the rear differential is toast...

Comments?