No smoke with my Burnout.

Ok, this is weird, At the track today this is the sixth pass I have made. When I do my burnout there is almost no smoke. Im reving to 6000 rpm 3rd gear auto on line lock I get some vibes coming out of rear during burnout. I wanted to film but that didnt workout. My wife watched me during burnout and said my right rear tire wasnt moving. I was told it has a spool I am doughtful now. Im thinking its got a bad suregrip. Problem is when I got home and spun the tires by hand it feels locked. I am wondering what the symtoms would be if it was a bad suregrip. Any thoughts. Tommorrow Im tearing it apart to find out whats really in there.