When I accelerate in 1st and 2nd gear, from ~5k to ~8k I get this weird vibrating which seems to be coming from the passenger rear. It increases in intensity w/rpms and doesn't happen in 3rd gear. It's loud as hell and really has me worried...I'm wondering if I damaged something at the dragstrip? I didn't do any crazy launches; 4k as always.

I'm definitely perplexed. Anybody have any ideas?

 

Did you throw a wheel weight at the drag strip?