I know how strange this one sounds, but basically just what the title says. Anytime I hotbox the tires, be it at the track or an old parking lot, it won't shift period. Doesn't matter what gear I try, it doesn't wanna go. The first time this happened was at the strip last fall and I shifted out of first and didn't get it into second. Let her sit for half and hour and no difference. Kept working the clutch in and out, and all at once, it just went in like normal. And when I say normal, this is the hardest shifting car I've ever been in. It doesn't grind or anything of the sort, but it takes some muscle to push into any gear whether it is cold or hot. The clutch does feel like it is functioning proper, as far as I can feel. Any theories?