ok heres the run down.. my diff mount on my fc broke so i got a new one and had it welded so it wouldnt brake. now everytime i launch or go sideways it sounds like a jackhammer is under my car anyone have any ideas on what it could be? any help would be bad ass.. you can also call or txt me at 813 335 0638. this pos is my dd and i dont want to drive it how it is. thanks