I took my 2nd GN to the track on 10-27-12 & ran 4 passes. my best was 12.2 at 110mph with GN leaning out on top end. even though I raised the fp, I couldn't get the right numbers on the sm. so I hade to lift on 2/4 runs. on way home I checked the tc lock up switch, to make sure it was working when at a stop sign. when I took off I felt the tc start to sound like gravel or marbles inside it. GN took off sluggish. I got her home & parked it. I will check on my next day off, but I think my tc is toast. what else should I check to elimenate the tranny itself?