Home » Public Forums » GMCnet » Noise need help diagnosing! (Loud clack clack clack )
| Noise need help diagnosing! [message #363081] |
Sat, 27 March 2021 10:10  |
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dservati1
Messages: 109
Registered: December 2013
Location: Western New York -Rochest...
Karma: 1
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On our trip and when I slow down I hear a click clack clack clack clack clack clack the coach has been driving great strong 65 miles an hour. When I put it in neutral and the coach slows down, the noise comes back, when I accelerate even a little bit the clacking goes away. I checked to make sure I didn't have a lug nut floating around in the hubcap, and I've taken a temperature on the bearings and they are fine. I'm thinking a CV joint or transmission is about to explode!? I got underneath no grease no split boots pulled out all of the joints everything seemed fine wondering if it's a governor gear? What are your suggestions If? If you guys could cross post this on the other GMC groups that be great thanks,again not sure any thoughts?
Update 1- not the hub caps
Update 2 - I disconnected the intermediate speedometer cable from the transmission because the needle was bouncing under 15-20 mph, didn't impact the issue.
Update 3 - at Cherry Hill Park campground in Maryland outside DC
Update 3.5 - coach idles fine no noise and the noise doesn't seem to be related to engine RPM at rest.
Dave
(David Martin on Facebook)
'78 Palm Beach. car nut new to RV'ing 26 ft. 403 rebuilt in 2018, rebuilt tranny in 2014, Dave Lenzi knuckles & hubs, yada yada yada on ION wheels,Green Brady Bunch stock
David Martin on Facebook
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| Re: Noise need help diagnosing! [message #363085 is a reply to message #363081] |
Sat, 27 March 2021 11:09  |
Silvernort
Messages: 95
Registered: June 2019
Location: Rock Springs, WI
Karma: 0
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Check your drivers side inner drive flange. Suggest you don't drive it any more til you do.
Let us know.
Shane
Shane Harvey
1973 26' "Packer Backer", 1976 Palm Beach, 1965 Dart
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| Re: Noise need help diagnosing! [message #363089 is a reply to message #363081] |
Sat, 27 March 2021 12:46 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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dservati1 wrote on Sat, 27 March 2021 11:10On our trip and when I slow down I hear a click clack clack clack clack clack clack the coach has been driving great strong 65 miles an hour. When I put it in neutral and the coach slows down, the noise comes back, when I accelerate even a little bit the clacking goes away. I checked to make sure I didn't have a lug nut floating around in the hubcap, and I've taken a temperature on the bearings and they are fine. I'm thinking a CV joint or transmission is about to explode!? I got underneath no grease no split boots pulled out all of the joints everything seemed fine wondering if it's a governor gear? What are your suggestions If? If you guys could cross post this on the other GMC groups that be great thanks,again not sure any thoughts?
Update 1- not the hub caps
Update 2 - I disconnected the intermediate speedometer cable from the transmission because the needle was bouncing under 15-20 mph, didn't impact the issue.
Update 3 - at Cherry Hill Park campground in Maryland outside DC
Update 3.5 - coach idles fine no noise and the noise doesn't seem to be related to engine RPM at rest.
Dave
(David Martin on Facebook)
Dave,
Silversnort has a good start, but without hearing it, I could also sort of fit that to a loose torque converter or flex plate. Update 3.5 makes this less much likely.
Fortunately, there is a lower cover than can come off easily so you can put a wrench on the converters fasteners. Now that two are possibly eliminated, if you didn't find a good bet, try shaking the torque converter. It should not move at all. If the flex plate screws are loose, that is a Big Issue. Let's hope you found it before this.
If you did not, come on back, there are ways the flex plate can be managed. It will not be fun or easy.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Noise need help diagnosing! [message #363101 is a reply to message #363097] |
Sun, 28 March 2021 08:24 |
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Richard RV
Messages: 631
Registered: July 2012
Location: Full-timer for 12 years, ...
Karma: -17
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It's good to have friends and family. Glad you caught it in time.
Good luck, Dave!
Richard
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemont waiting its turn
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| Re: Noise need help diagnosing! [message #363103 is a reply to message #363081] |
Sun, 28 March 2021 09:02 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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You can have Cinnabar ship you a pre loaded and setup 3.42 final and get a core charge back for your old one
John Lebetski
Woodstock, IL
77 Eleganza II
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| [GMCnet] Re: Noise need help diagnosing! [message #363126 is a reply to message #363103] |
Sun, 28 March 2021 17:54 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Check your inner constant vel connection at the final drive. 6 bolts on
each side of final drive.
On Sun, Mar 28, 2021 at 7:03 AM John R. Lebetski
wrote:
> You can have Cinnabar ship you a pre loaded and setup 3.42 final and get a
> core charge back for your old one
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| [GMCnet] Re: Noise need help diagnosing! [message #363128 is a reply to message #363126] |
Sun, 28 March 2021 18:00 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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It is standard for the driver side of final to have slop as there is no
load on the spider gear.
The noise is not coming from there,
On Sun, Mar 28, 2021 at 3:54 PM Jim Kanomata wrote:
> Check your inner constant vel connection at the final drive. 6 bolts on
> each side of final drive.
>
> On Sun, Mar 28, 2021 at 7:03 AM John R. Lebetski
> wrote:
>
>> You can have Cinnabar ship you a pre loaded and setup 3.42 final and get
>> a core charge back for your old one
>> --
>> John Lebetski
>> Woodstock, IL
>> 77 Eleganza II
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.gmcrvparts.com
> 1-800-752-7502
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Noise need help diagnosing! [message #363129 is a reply to message #363081] |
Sun, 28 March 2021 18:59 |
Tom Katzenberger
Messages: 399
Registered: June 2019
Location: Kingsville, MD
Karma: 4
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Senior Member |
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Dave,
I am 1 hour to the north, in Baltimore. If you need to rebuild the CV, I have new boots I just bought from Jim K. that came in this week. I can pick you up after work and we can use my new parts to rebuild the CV at my Shop. I have 3 GMC's at the shop in various conditions.
Let me know if I can be of assistance?
Take care,
Tom
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee Ignition
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| Re: Noise need help diagnosing! [message #363138 is a reply to message #363081] |
Mon, 29 March 2021 20:41 |
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dservati1
Messages: 109
Registered: December 2013
Location: Western New York -Rochest...
Karma: 1
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Senior Member |
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Well with the help of my awesome Son Sam Servati who drove over 7 hours and brought his mobile GMC Repair Truck packed with His whole tool chest, bench grinder, power tools, chemicals, and more. Plus two final drives, which we had the pick of so we picked the one that we thought had a little more life left in it. We.pulled the final drive and found that the pinion gear had lost several teeth and chunks where in the Pan. So the diagnosis of the final drive was correct. We gotthe replacemenr in on the second try! Never hurt the new gasket as we took the advice of many in the community. My son even had a spare tranny and torque converter, stub axle, cv axle, two gaskets, and assortment of axle bolts all from the gracious mister Ernest Dankert a member of the Heritage Cruisers. I was tempted to take that transmission and keep it in the back as a spare for the rest of the trip!! - but it's going back to Rochester. Thanks also to Ken Frey for the diagnosis advice, and Jonathan Roche, Ray Erspamer, and others who offered advice and assistance. We are back on the road again!
Dave
'78 Palm Beach. car nut new to RV'ing 26 ft. 403 rebuilt in 2018, rebuilt tranny in 2014, Dave Lenzi knuckles & hubs, yada yada yada on ION wheels,Green Brady Bunch stock
David Martin on Facebook
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| Re: Noise need help diagnosing! [message #363189 is a reply to message #363129] |
Fri, 02 April 2021 06:41 |
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dservati1
Messages: 109
Registered: December 2013
Location: Western New York -Rochest...
Karma: 1
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Senior Member |
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Thanks Tom. The replacement final drive got us to South Carolina and I'm hoping back home to Western New York. But if I have any issues as I pass through the Maryland area on Sunday or Monday I will reach out to you.
'78 Palm Beach. car nut new to RV'ing 26 ft. 403 rebuilt in 2018, rebuilt tranny in 2014, Dave Lenzi knuckles & hubs, yada yada yada on ION wheels,Green Brady Bunch stock
David Martin on Facebook
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