Hey guys I'm new to this forum stuff hahahha.I have a 2001 duramax and it has a terrible hop.I've replaced a motor mount and all my u joints balanced my tires 3 times and now today replaced the drive shafts with another used one but with new u joints again.I don't know anymore.I'm at a lose.any ideas guys?

 

is it in 4wheel drive?

 

when does it "hop"? and maybe try to explain it differently if you can...vehicles don't really hop. When you balanced the tires were they roadforced or just balanced? try rotating the tires?