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Old 03-12-2015, 03:48 PM   #1
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2012 Ace 29.1 - Loud whine from rear at 60 mph

I bought our Ace 29.1 second hand with 8K miles and am very satisfied, but have with one concern. Between 50 - 60 mph a loud whine is comes from from the rear of the unit. Disappears at 60 mph. Not sure if it is tire noise or rear end whine. Anyone else have this issue?
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Old 03-12-2015, 04:39 PM   #2
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Hi Ron, Welcome! I have a 2012 ace 29.1. I have about the same number of miles. My ACE has no whine at all. My RV has had very little problems over the 4 years I have owned it. I got it March 2011. I did have at THOR expense after warranty was over move my generator from under drivers seat to the back passenger compartment. It has been a big improvement and no longer stops on extremely hot days. Other than that there have been just minor issues that I have fixed or added myself. I added 2 L.E.D.lights to the outside grab handle and it looks great. Good luck and I hope you enjoy yours as much as I do mine.
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Old 03-12-2015, 10:58 PM   #3
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I have a '93 Fleetwood Bounder which I purchased new and it also had a noticable whine right from the start. This occured between 57 to 62 mph. I am pretty sure this is a differential whine and not anything to do with your coach body. There is probably nothing you can do, just the luck of the draw. In my case I just avoided that speed range, which was not a great inconvenience because I preferred 55mph as my top speed.
During my career as a machinist I cut many gears of all types and in an assembly it takes very little variance to produce a whine sound or resonance at a certain rotation speed and load. The noise can be very difficult to diagnose. Most likely it is the mating of the ring and pinion. In theory it will be their forever, but over the years and 200k miles mine actually quieted down very slowly and steadily. which does not make sense to me. With wear one would think there would be more chance of vibration. If it is your differential gearing it will probably not affect longevity, like abuse does, just a big annoyance.
I would take it to a Ford truck dealer and ask them to test drive it and get their reaction. Maybe you can get them to swap out the gears. No amount of adjusting will fix the problem in my experience. The gearing I am familiar with was not associated with automotive applications.
Does the whine occur under light load and change under no load or heavy load? If it does I would again think pinion gear. There are technical papers you can find on the web which explains our problem, I will try and find one and post it.
I would avoid automotive posts on forums about this issue, too much misinformation might be found, like mine above perhaps.
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Old 03-14-2015, 01:18 PM   #4
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Gear Noise

Thanks for the response guys........ Kevin I too thought it was noise from the differential because it is mainly happening under load and almost disappears when coasting. Your experience of the noise getting better after 200K sort of makes sense if the noise is caused by insufficient clearance which could be resolved by shimming out the pinion. ( I haven't made any gears but am a millwright by trade and was also a supervisor in a machine shop so have some basic knowledge) I may take your suggestion and get a truck shop to take a look. I may just put up with it and drive at 60 mph although I also prefer 55 mph. Thanks again for your help.
Ron
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