Originally Posted by BLKITR
So in conclusion, Type R 801 is right on the money. One tire has to be on the ground to verify if a differential is installed.
Technically that's not true.. in neutral the other wheel might spin some, but should stop. at least that's how every stock LSD I've tested as done. open diff will not stop (until the other wheel stops of course).
But the one tire only in the air probably is best but I've never tried it.