OEM LSD Question

[Ivan141]

If you have the stock LSD then there is a good chance of it being broken. The only way you can tell from outside is usually some marks on the clutch members from where they rubbed the pinion wheel.
Try turning your drive shaft by hand with the car parked (rear wheels locked). If there is significant play (say 5mm) then it's almost certainly a broken diff.

The stock LSD is not usually noisy, aftermarket LSD's can be. As long as you use LSD specific oils
you should be fine. I would be surprised to break an LSD, certainly not behind an SR20.