[A1980GMC]

Need a little more info to really help you. Does it sound like it could be an exhaust leak. Lots of time when you have exhaust work done the place may have done a really sorry job. Their welds could have not been so great and you get a leak. Does the sound get louder and faster as you accelerate? If it sounds more metal like then check into your U-joints.

Laters, Ryan

 

[A1980GMC]

Hey Red_Z does it still make the noise when it is just idleing? Will it make the noise if you have it in park but give it a little gas? If it does not then it is problably not an exhaust leak and it is in the driveline.