Not to worry rino, just get the car safely lifted and secured (did you end up getting those 12 ton jackstands?) like larry and lance have said, it's probably something simple.
John
with the car in neutral, you may not be able to rotate the driveshaft from the tire. usually, the opposite tire will spin freely the opposite direction, so you may have to crawl under the car and manually turn the drive shaft.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!