It runs great, idles perfect.. IT only does it if i hit the gas hard and let off real quick..on my old gt i had an aftermarket exhaust and that used to bang the bottom of the body when i did that but my new gt is stock and does it..Could it be a engine or tranny mount cause them to bang the frame?
Driving only .. If you are even cruising sometime and let off the gas it will bang.. i looked at the mount thats on the firewall attached to the trans. and there is no rubber what so ever in the mount..