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when a viscous coupling LSD goes bad (assuming gears arent chewed up), you usually loose the ability for the tow rear tires to turn at differnt speeds, it feels like torque bind. If the gears are shot you will get a howl that increases with volum with speed.
Popping noise from the middle of the car will be bad universals or bad carrier bearing. There are two driveshafts (half shafts) ubder the car delivering power to the rear wheels. They use good old fashioned U joints and are easy to diagnose. Just get under the car and shake everything in the x-y direction, there should be zero play.
When do you hear this popping noise, and can you feel it in your seat or your feet.
nipper
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