When I drive on roads that are very wet (enough to splash undercarriage), my car vibrates pretty horrendous. I don't have any abnormal noise or vibrations when roads are dry. Inspections of drivertrain don't seem to detect anything: axles, wheel bearings, universal joints, or carrier bearings. I also experienced this with my previous trans and transfer case, and doesn't seem to be getting worse with time.
Was wondering if anyone had any ideas? Can't crack this one and don't want to buy parts I don't need to diag.