Strang noise? Floor boards?
 

Recently I have been getting this weird noise. When ever I get on it hard I hear a noise that sounds like the floor boards are crunching or something. But I see no signs of damage anywhere. Could it be the rear tires rubbing? broken torque boxes? rear end bouncing off the pinion snubber??? Anyone else ever had this problem? It's driving me nuts, I'm afraid to hammer it cause I get that loud thunking noise. Keep in mind I do run slicks at the track. I know it's not anything in the rear cause it's all new. Thanks

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87 GT, 4 inch cowl hood,17x9 Cobra R's/255/45's,GT-40 heads,long tubes headers,h-pipe,Flows,BBK cold air, Mass air,70mm MAF, 1.7's, 1" spacer,underdrive pulleys,Pro 5.0, King Cobra, Adj. fuel Reg., Lakewood Lift Bars,50/50's,subframes, 4.10's.
Best time 13.012
Best MPH 104
Best 60' 1.816

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I also have the same problem....I think. If I am rolling and stomp on it, I hear a thump. Could it be the tranny, engine mounts??