RV particulars:
Driveline (Engine, Transmission):Ford V-10, 4R100
Miles: 22000
Year: 1999
Break Down Description: Severe Vibration
Symptoms: Vibration which appeared to be in the front end. Ford TSB about wheels not self centering, holes in wheels larger than hubs.
Effect: Caused a severe vibration usually between 25MPH and 65MPH. I could feel it in the steering wheel and because I had knowledge of the TSB, I assumed it was the wheels/tires on the front. Had front end alignment and all tires rebalanced. No change. Next trip had front wheels manually centered. No change. Front tires were cupping irregularily, rotated tires per Ford and Goodyear specifications, no change. Put airbags on the front, no change. After 22,000 miles took the motorhome to dealer. Took it for a test drive with the shop manager. (NOTE: I have been the only driver) After he walked around the M/H while in motion, he drove and had me walk around the coach. Vibration was extremely severe over the rear axle.
Cause: 3 of the rear axle bearings shot. Replaced all the wheel bearings in the rear end
Outcome: Vibration non existant now. (NOTE: I was only able to test drive the M/H for about 40 miles before I put it up for the winter, but so far so good.)
Apparently the vibration had traveled up the driveline to the transmission and then to the steering box. Lesson learned, don't assume anything and check everything. Luckily Most of the attempted repairs and the major repairs covered by warranty, after about $4000 worth of repairs, I am only out about $400.