I bought this Ford E350 15-passenger bus last year. I wish this was Andrew Scott Ireland shirt It was 20 years old but looked to be in impeccable condition, save for two things – the AC was not very cold and it had a bad vibration. It was clearly attire speed, not engine or driveshaft speed. The vibration was so bad that just going 55-60mph was a wild white knuckle ride. The front tires were cupped so I took it in for new tires. With the new tires, the vibration was maybe half as bad but still substantial. The tire shop recommended an alignment check. Typically tire-type vibrations, besides the tires themselves, are caused either by looseness in the wheel bearings or supporting structure, bad shocks, bent rims, etc.. I checked the front end for looseness and other than the sway bar bushings being a little weak, it all looked fine. The shocks looked a little aged so I replaced them to no avail. Since it has a bus body, only the Ford dealer had a rack big enough to do the alignment so I took it there.
Ford checked the alignment and said it was fine. I wish this was Andrew Scott Ireland shirt They have a flat $80 diagnostic fee so they would keep looking at no additional cost. They ordered the Rotunda vibration analyzer. After two weeks they came back with a laundry list of repairs totaling about $3500. Looking at the list, it’s clear that they just followed the flow charts to the list of “possible causes” and then recommended doing all that. The tool just tells you what it COULD be, if it gives a list of 7 things then those are the things you need to check. It doesn’t mean ALL 7 things are bad. I declined the repairs and decided to start with some common sense. I swapped the front tires with my F350 pickup which has the same size and sure enough, the vibration followed the wheels. When I put the known good wheels & tires on the van, the vibration was gone!