03 4unner

Thats abnormal. Scotch the wells make sure it will not roll. Try turning the motor over by had per instructions in the repair book most time it is the crank shaft pulley may have to put trans in neutral, I have not had this happen before but this is what I would try. move it a little and see if it will come free. Starters turn the flywheel which is mounted to the rear of the engine.

See if there is a lower bell housing you can remove to gain access to it and also look for fly wheel damage, otherwise trans may have to come out.