Thumping? Please elaborate.. Also, email me since im hardly ever on here anymore since i no longer own a vette. The only thing I can imagine that your refering would maybe be the brakes? I heard something somewhat similar to what your saying once when coming to a slow on the hwy, thought it was possibly brakes (only thing I haven't replaced), but never heard again since that incident so I didn't think too much of it. If it's THUMPING, That doesn't sound normal though and I have never felt it THUMP ever!.
BTW: you should be recieving the extra keyfob/receipts from upgrades and such. I recently found out the secretary that was supposed to send it, never made it out. Why haven't you asked about this? lol, I sure would have.

hey jason quick question. wondering if you have any idea what the deal is with the rear of the car under braking? That thumping sound that slows as the car slows. you can also feel it. I would really like to know so i can fix it before some shit falls off the car while im driving. thanks.