I have a tiny noise that is driving me nuts when im at light throttle that i think might be coming from the driveshaft or U joints. Possibly even the rear differental. No vibration though. It just sounds like something may be out of balance. Anyone else have a similar issue? I have roush axlebacks so when i give it gas you cant hear it over the exhaust so i dont know if its there or not but it certainly is a light crusing throttle.

 

I had similar issues twice. 1. Loose muffler hanger 2. Heat shield vibrating. I'd jack the car up and start with the exhaust.