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Old 08-13-2003, 08:37 AM   #1
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Question "Whirring" Noise in the Driveline at Speed

Does anyone else get a "whirring" sound from their driveline while coasting? I've noticed a pretty substantial whirring noise and corresponding vibration in the pedal and steering wheel in the 345 when I match the engine power exactly to the driveline speed. Sounds kind of like a low volume version of driving over the rumble strip on a highway shoulder. In fact the first time I heard it I thought that's what happened.

I can even move the sound and vibration in and out by increasing or decreasing the gas pedal at highways speeds. It only occurs within a very narrow range and lasts only a second or two. When I'm on the gas or off the gas it does not happen at all but I can hear it when applying power from a coast (engine braking downhill to full power uphill).

It's very noticeable at higher speeds (70 mph) but not nearly as bad at 60 or 65. I'm thinking it could be U joints or something else in the driveshaft itself or maybe an input shaft?

Please chime in with any similar experiences or advice. As always it will be greatly appreciated.
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Old 08-13-2003, 08:51 AM   #2
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It sounds like the beggining of a U-Joint starting to go. I'd have it checked immediatley and replace before its too late. You can somewhat check it yourself by putting the tranny in park engine off. and trying to rotate the driveshaft back and forth. There shouldnt be much if any side to side movement.

Jai
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Old 08-13-2003, 08:57 AM   #3
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Thats what I was thinking too. When you're driving along at 11:30 at night through PA going up and down hills, listening to this noise you start to imagine all of the spinning parts under there and how bad it would be if you blew a U joint on the road. I'll get under there tonight and check it out how much play is in the driveshaft.
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Old 08-13-2003, 09:02 AM   #4
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not very much at all. There shouldnt be any dead stops in the play either. Try to manipulate the drive shaft right near the U-Joints so you can hear any bangs when it stops moving. Chances are it is the rear one but make sure to look at them all.

Jai
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Old 08-13-2003, 09:06 AM   #5
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you dont want to drop a drive shaft. your wallet will cry. i would also check the carrier bearings . lol
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Old 08-13-2003, 09:28 AM   #6
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Quote:
Originally posted by wb13798
you dont want to drop a drive shaft. your wallet will cry. i would also check the carrier bearings . lol
al
Beyond the incredible noise this would make, followed closely by an over rev'd motor and transmission, you all would hear a very loud cry from me!

I'm trying to be as proactive as possible on this new to me MH and replace anything critical and suspect right away. So far, I've been lucky as things are in better than expected condition. The best part is that NAPA has almost everything needed on the chassis and the parts are el cheapo to buy!
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Old 08-13-2003, 09:33 AM   #7
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Smile

The wonders of a P-30 chassis never cease to amaze. Its nice not having to shed a tear everytime you need to buy something. Napa is just down the street from me, with the exception of a belt length everything they have sold me fits like a glove. I even whined enough that they give me jobber pricing now.


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Old 08-13-2003, 09:43 AM   #8
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You are definately right about the P30. Part of our decision to go with the AS was this chassis. I threw an alternator belt in a SOB diesel pusher once in MA and couldn't find a belt for 100 miles! Ended up finding one in a storage bay, but it scared me enough to adopt the KISS concept for my own MH.

Seems like our AS has the right combination of ride quality, reliability and parts availability for us DIY owners. Makes me wonder why so many modern MH's have such overly complex chassis and systems.
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Old 08-13-2003, 09:58 AM   #9
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Amen!
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Old 08-13-2003, 10:27 AM   #10
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Start it, hold the brakes on and go from drive to reverse a couple of times and listen for a clunk. If it does it is probably a U joint. If not check the carrier bearing and your rear axle lube.

John
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Old 08-13-2003, 06:33 PM   #11
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There is a definate clunk sound when going from drive to reverse and back. More on the reverse to drive than the other way around. So...I'll order U joints tomorrow. I haven't crawled under there to look at them. Any tricks or special tools needed?
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Old 08-13-2003, 08:33 PM   #12
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before removing the drive line mark every thing and make sure it all goes back like it was. or you might have a balance problem. i would go ahead and replace the carrier bearing while you have the drive line out. lol
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Old 08-13-2003, 08:54 PM   #13
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clunk

Don't be surprised if the clunk is still there after replacing all the u-joints. The biggest clunk is probably coming from of the differential.
I once went thru replacing all the u-joints, carrier bearings and had the driveshafts balanced and still had the 'whirring' at a certain speed. Brought it to a drive line shop and they found a worn yoke at the transmission.
Remember the park function doesn't work real well with the drive shaft off
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Old 08-13-2003, 08:55 PM   #14
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Check that Clunk!!

The clunk you heard might be the transmission yoke fitting in need of some serious lube. Very common problem in the GM world of 454/TH400 combination. So along with the u-joints I'd make sure the yoke and splines are well lubricated. This clunk will return so plan on an annual re-lubing!!

Hope that is of some help.

Take care,

Sean
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