Driving Vibration

[Locksmith]

I have a 2003 Gulfstream Yellowstream Class C Ford E450HD V10 32 ft. I had a squealing noise in sync with the drive shaft. I had the center bearing replaced on the 3-piece drive shaft and the noise stopped, but I have a vibration at 40-53 mph. I was told that my drive shaft was out of balance, so I had the shaft balanced, and that didn't correct the problem. I was then told The back brakes were causing the problem. I had them rebuilt and the problem is still there. I told the RV center that I thought it had to be something to do with the replacement of the center bearing and they say that the bearing is good and installed properly. I'm out over $1000.00 and the problem isn't resolved. I believe in preventative maintenance and since I bought the unit new I have only had this RV shop service and do the work. Can anyone help, I'm about out of money.
Locksmith

[94-Newmar]

Vibrations can be so difficult to find, especially in multi piece setups like yours. Contact driveline shops in your area and explain the issue. Ask if they can truly balance a multi shaft setup, not all can. It is possible they put the driveshafts back together out of phase.

Some links to read:
SIMMONS 4X4 AUTO REPAIR CENTER | The Driveshaft Department
Action Machine Inc - Driveshaft FAQ - Answers on U Joints , vibration, stronger / lighter shafts
At my wits end with driveshaft vibration

[tims52ford]

Are all your driveshafts in phase or when you toke them a apart to replace the hanger bearing, did you lined up the arrows on the stub shaft with the main shaft.

[Locksmith]

Yes everything was lined up properly on the reinstall after the drive shaft was rebalanced. I had new tires installed a year ago and the tire company has looked at them twice and rotated them and said it's not a tire problem. I had the rear brakes replaced and a year ago I had the fronts replaced. The RV shop has checked and rechecked and done all of the work on the unit since I bought it new in 03. They don't know what to do next. I'm going to drive it and see if it gets worse and then maybe we can get it fixed. It has been great to get all of the advice from you folks. Thanks again.