I have a 95 gt convertible. We just got through putting in Steeda full length subframe connectors,3:73 gears, aluminum driveshaft and a diff. girdle. I noticed when I brought it home from the shop that at about 40 mph I can hear a ringing sound, like the sound of a bell or vibrating metal. The noise gets higher pitched the faster I go. I have looked underneath the car and can find nothing loose. This noise was not there before the changes were made. It only happens when I'm on the gas. The shop rebuilt the Trac-loc also and said it was setup very tight but the noise from that stopped after just a few miles after the lube got worked in. Any ideas???