I have a 2000, 2.7T and I recently bought 2 Perelli tires and had them put on about 2 weeks ago. The other 2 are Michelins that were purchased in august. The Parellis and the Michelins have about the same tread depth, but the guy told me that I should have just gotten 4 new tires since it is an all wheel drive vehicle and I could mess up the drive train.

On Monday while I was driving to work, it made this load clicking noise that happened whenever I would accelerate. It also sort of rumbled when I was driving at slower speeds. It was like a fast slight shake. Any ideas what it might be? I'm sort of scared to drive it to the dealer to get it checked out.

 

Bad balance? One of the weights might have dropped off.
Hopefully its that.

 

Tread depth has nothing to do with tire diameter, the diameter can change with speed, and different brand tires canhave different diameter changes when at speed. Matched tires on a Quattroan important starting point for any problem like your experiencing.

If it was OK in Aug and the problem is recent - I would consider looking at something other than tires although balance is worth a first look. The most obvious place to look is the brakes followed by CV joints. --But I'll bet the dealer will make a pointed comment about unmatched tires!

PS - Can any guess who I am rooting for during the Superbowl??

 

Typically if I heard someone tell me about a loud clicking / can crushingnoiseonly durring acceleration and a rumble at lower speeds I would tell them they most likely have an exhaust leak.

But I haven't heard the noise, and thats taking the tire theory out of the equation.