I have a base model 2001 Mazda Miata that I bought used and I don't know if it has the optional limited slip differential or the open slip differential. Any way to find out? Thanks!|||Thomas B is almost correct, the correct procedure is this:
1. Jack up rear, put on jack stands with front wheels chocked (safety first!).
2. Put transmission in neutral and leave E-brake off.
3. Have a friend hold one wheel in place while you rotate the other wheel forward. A Normal open differential will spin forever while a LSD will lock the wheels together promptly. Make sure you rotate the wheel slowly and your friend has a firm grip on the wheel by the spokes, so it doesn't hurt him/her by wrenching it out of his hands.
Usually, Mazda has a small metal tag bolted onto their differentials to note the ratio and presence of a LSD. On my FC (1987 GXL), it says "3.909 Limited Slip".
While it's jacked up, it's probably a good time to change the differential oil. I recommend Royal Purple, Redline or Mobil 1 full synthetic gear oil. Some diffs are a pain, Mazda ones usually aren't. All you need are proper sockets for the drain and fill plugs, a length of garden hose, the proper amount of oil to go in (its in the Factory Service Manual, or check a good Miata forum) and some patience|||Jack up the car so both tires are not touching the ground,
Put the transmission in neutral and release the parking brake.
Turn one rear wheel.
If the other wheel turns in the same direction you have a LSD.
If not, you don't.|||do a burnout, 2 tires = lsd, 1 tire = open diff.
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