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Old 07-12-2013, 06:51 AM   #43
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No. It only happens when a gear change happens. For instance, traveling along a flat road at 70 mph produces no unusual noises/sounds. However, the minute you start up a hill and the transmission shifts from drive to next lower gear (4 or 5??) (about 2700 rpm), a loud noise emanates from the rear end and remains as long as you are in that gear at that rpm (speed). IF you go slower, sound disappears.

Going to pack the wheel wells with U Haul packing blankets to see if that helps.
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Old 07-12-2013, 12:14 PM   #44
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So it only happens when the drivetrain is more heavily loaded such as going up hill.

What about when accelerating from a stop?
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Old 07-12-2013, 03:05 PM   #45
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Ok traveling now. Does do it for brief instant getting going. We are in rolling hills. No downshift required to make noise at 68 mph. Need to turn my iPhone into sound level meter. Everyone try this Set cruise for 70 mph. Tune your ear to cruise sound level. Now go up a hill and see if your hearing notices a change in sound level. Much more noticeable in back seat.
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Old 07-13-2013, 10:06 PM   #46
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Will try to check on our trip next week.
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Old 07-15-2013, 06:18 AM   #47
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Quote:
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Everyone try this Set cruise for 70 mph. Tune your ear to cruise sound level. Now go up a hill and see if your hearing notices a change in sound level. Much more noticeable in back seat.
You've got both a speedometer and a tachometer in the dashboard. See if the noise coincides with a specific engine RPM, regardless of your speed, or if instead it happens at a specific speed regardless of engine RPM.
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Old 07-18-2013, 02:03 PM   #48
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You've got both a speedometer and a tachometer in the dashboard. See if the noise coincides with a specific engine RPM, regardless of your speed, or if instead it happens at a specific speed regardless of engine RPM.
Still traveling but definitely not speed but rpm. Happens at 1800 rpm and 2800 rpm going uphill. Does not happen going downhill. Very slight noise on level. I can feel the floor vibrate and seems to exist on the drivers side in the rear by the fridge. Could the floor not be secured?
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Old 07-18-2013, 02:15 PM   #49
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Still traveling but definitely not speed but rpm. Happens at 1800 rpm and 2800 rpm going uphill. Does not happen going downhill. Very slight noise on level. I can feel the floor vibrate and seems to exist on the drivers side in the rear by the fridge. Could the floor not be secured?
In my Interstate with the wardrobe closet, the closet is located just forward of the wheelwell, and the whole galley is moved forward to make room for the closet. The presence of the wardrobe closet helps secure the floor.

Since I never ride in the back of mine (there's no one else I'd trust to drive it) I can't say for sure if that makes a difference in the noise level.

Anybody out there with the lounge/wardrobe floor plan experiencing the described noises, or just those whose Interstates have the lounge floor plan without the wardrobe closet?
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Old 07-18-2013, 07:09 PM   #50
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I am sitting in the rear of my non-extended lounge version and do not hear any drivetrain noise other than some slight rear end howl as the load changes sometimes.

I will admit that riding back here is an E-ticket ride.
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Old 07-19-2013, 07:13 PM   #51
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I am sitting in the rear of my non-extended lounge version and do not hear any drivetrain noise other than some slight rear end howl as the load changes sometimes.

I will admit that riding back here is an E-ticket ride.
Yes that is what I hear is loud howl when the drivetrain is under load at 1800 and 2800 rpm.
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Old 07-19-2013, 09:22 PM   #52
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Rear end (differential) noise is usually caused by either the gear set not being set up properly or just bad gears, more likely the former.

I hope the fellow w/ the rear Konis gets them installed and reports back cuz the ride in the rear is unsat. As is the overall A/C.
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Old 07-20-2013, 12:48 AM   #53
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Not sure if I am that fellow but I do need to give a follow up report. I had previously reported that putting the Koni's on the rear had vastly improve body control over left right transitions (driveway entrances and such) but I still have not had a passenger ride in the back. Since then I have added the Koni's to the front end and I am very happy with that purchase as well. It's not quite as transformative as the rear shocks, but it makes the coach feel much more stable and controlled, particularly when towing a heavily loaded trailer. I mentioned last time that I had purchased the camber bolts for the front struts. We opted not to install those as the shank is significantly smaller than the factory bolt and we were not comfortable giving up that much cross section on such a critical suspension fastener, plus the Koni front struts have some adjustment in their bolt holes that was sufficient to eliminate the positive camber that was present with the factory front struts.
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Old 07-20-2013, 07:57 AM   #54
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I agree the AC in the back is Unsat...however, the AC seems to improve in airflow if I crack the overhead vent or one of the back windows... bathroom vent???? I'll try tomorrow.
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Old 07-20-2013, 02:13 PM   #55
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I run the bath exhaust to help keep it from becoming a sauna and have a 10" fan sitting on the counter blowing to the rear and still can't keep the RV comfortable when the ambient temp. goes over the upper eighties. I need to check the outlet temp. on the chassis air to see if it's within spec. The rear A/C only produces an 18* drop which is low but it's a sealed system and was advised that if you add a Schrader valve, you'll be adding Freon once a year. Need to check the exterior unit for anything that is blocking the air flow like cottonwood fuzz. The inside unit was clean as was the filter.
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Old 07-20-2013, 08:05 PM   #56
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Quote:
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I am sitting in the rear of my non-extended lounge version and do not hear any drivetrain noise other than some slight rear end howl as the load changes sometimes. I will admit that riding back here is an E-ticket ride.
I did the Koni's front and rear as well as a sway bar and the ride is substantially better as a passenger in the rear.

It's not limo smooth, but it was plain unacceptable before.
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