i was under my car tonight tightening up my exhaust. With the back tires up in the air, i spun the driveshaft by hand. And when i did it there is a clunk noise, there is some play in it when i turn it before it catches, and when it catches is when i hear the clunk when it starts to turn the gears, cause of the play. Is there supposed to be play? The driveshaft moves roughly 1/4-1/2 freely before it catches the gears and the tires move. Is this ok? should i get it checked out?