work on your car. brother helped me out a few weeks back. told me he tightened them down. there are 2 bolts that bolt the crossmember to the tranny. both of them were backed almost all the way out. now i know what the banging was from. my fault for believing him i guess.
http://lh3.ggpht.com/_zt1IrYTCrOo/S5hd8SHBZ4I/AAAAAAAAAWM/YSc3GY3d14E/s800/bolt1.jpg
up close
http://lh5.ggpht.com/_zt1IrYTCrOo/S5hd8iS2gQI/AAAAAAAAAWQ/GGEX7Fa-yPY/s640/bolt.jpg
on a side note, did some soldering to get my reverse lights working today. the tko 600 reverse sensor was slightly different than the stock sensor, so i had to splice the wires, solder them to the sensor, and siliconed them to keep them dry. i shoulda taken pics.