We have a 1995 Isuzu Trooper that has a loud noise and vibration which starts at low MPH and seems to get the loudest around 40 MPH. It seems to be worse during acceleration if not go away totally. Don't have much history on this vehicle. I plan on checking the differential & trans oil level, drive shaft U joints and wheel bearings what else should I check? Is the trooper known for this and if so what's the normal problem? I will be happy to make a $20 donation if the information I recieve helps me locate the problem.