Home » Public Forums » GMCnet » [GMCnet] Whining
| [GMCnet] Whining [message #332475] |
Wed, 23 May 2018 20:25  |
Stephen Thomas
Messages: 29
Registered: May 2014
Karma: 0
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Junior Member |
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Hi Folks,
It's been a while since I've driven the GMC and I think there's a new
noise. It sounds like a whine that bearings or gears might make. The pitch
goes up and down with the speed of the vehicle (not the rpm of the motor).
I start to notice it at around 25 mph and it gets a bit louder on the
highway. It goes away completely when I'm coasting. My friends think I'm
being paranoid. They can't seem to hear it.
Any idea what could be making a noise like this? Do I need to worry or is a
little bit of whining normal? Any advice would be great.
Thanks,
Steve
78 Eleganza
Santa Cruz, CA
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| Re: [GMCnet] Whining [message #332477 is a reply to message #332475] |
Wed, 23 May 2018 20:37  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Sounds like something between the torque converter and the tires. Try hard
pull, deceleration, and neutral throttle and compare sounds. Take someone
with very acute hearing along with you during test drive. Check for high
temperatures on the final drive, inner and outer CV joints, and hubs,
knuckles, brakes, as well as rear hubs. Keep checking. These coaches are 40
years old. Crap happens.
Jim Hupy
On Wed, May 23, 2018, 6:26 PM Stephen Thomas wrote:
> Hi Folks,
>
> It's been a while since I've driven the GMC and I think there's a new
> noise. It sounds like a whine that bearings or gears might make. The pitch
> goes up and down with the speed of the vehicle (not the rpm of the motor).
> I start to notice it at around 25 mph and it gets a bit louder on the
> highway. It goes away completely when I'm coasting. My friends think I'm
> being paranoid. They can't seem to hear it.
>
> Any idea what could be making a noise like this? Do I need to worry or is a
> little bit of whining normal? Any advice would be great.
>
> Thanks,
> Steve
> 78 Eleganza
> Santa Cruz, CA
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] Whining [message #332486 is a reply to message #332475] |
Wed, 23 May 2018 22:17 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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Sounds like final drive. That sounds similar to what my coach was sounding doing with bad final drive.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Whining [message #332487 is a reply to message #332479] |
Wed, 23 May 2018 22:18 |
Stephen Thomas
Messages: 29
Registered: May 2014
Karma: 0
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Junior Member |
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The final drive was my first thought. I topped it off with about 5 oz of
oil, but I don't think that made any difference.
While I was under there, I found that the CV boot had a hole in it and
there was grease all over the place. The joint only has about 3000 miles on
it, but I don't know when it started leaking. I'd be surprised if this was
making the noise but, it wouldn't hurt to replace it, I guess.
I didn't think to check for heat. I'll definitely be doing that this
weekend.
Seems like a great excuse for a drive up the coast!
Thanks guys,
Steve
78 Eleganza
Santa Cruz, CA
On Wed, May 23, 2018 at 6:47 PM, Carl Stouffer wrote:
> It could be a gear whine in the final Drive. The fact that it continues
> to make a steadily increasing pitch noise and goes away on coast points in
> that direction.
>
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
> Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
> Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American
> Eagles,
> Solar battery charging. GMCSJ and GMCMI member
>
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| Re: [GMCnet] Whining [message #332494 is a reply to message #332475] |
Thu, 24 May 2018 06:04 |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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Senior Member |
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If it is a final drive don't ignore it like I did, mine had whined it since the day I bought it, thought it was normal. Guess it was slack in FD pinion bearing. It went out after 4 years and took out the output shaft of the tranny at the same time. When that happens like mine on a hill you sure wish you had fixed the parking brake. That's why I always carry wheel chocks in the refrigerator access door. Just from my experience. BTW I do have parking brakes now.
Skip Hartline
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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| Re: [GMCnet] Whining [message #332496 is a reply to message #332487] |
Thu, 24 May 2018 07:21 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Stephen Thomas wrote on Wed, 23 May 2018 23:18The final drive was my first thought. I topped it off with about 5 oz of oil, but I don't think that made any difference.
While I was under there, I found that the CV boot had a hole in it and there was grease all over the place. The joint only has about 3000 miles on
it, but I don't know when it started leaking. I'd be surprised if this was making the noise but, it wouldn't hurt to replace it, I guess.
I didn't think to check for heat. I'll definitely be doing that this weekend.
Seems like a great excuse for a drive up the coast!
Thanks guys,
Steve
Steve,
Some other information to gather:
Does it make this same sound in all gears? - You may have to hold it down to check.
Does it change at all with load? - There may be a short change when you back off the throttle.
Good Luck - have a nice, but boring drive.
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: [GMCnet] Whining [message #332498 is a reply to message #332475] |
Thu, 24 May 2018 07:56 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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I would do about 35 and see if pitch is same in D and S. If so, you can rule out engine and most likely MOST of the trans except output shaft section. I would then in S get lightly on and off the gas as if driving a manual and see if loading, unloadind, decel loading follows what would be final drive gear or bearing noise. I would drain and catch final drive fluid as a clue to metal in fluid. Easy test. Good catch on boot but that is not a whine candidate.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Whining [message #332570 is a reply to message #332475] |
Fri, 25 May 2018 20:25 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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More'n half the time that's coming from the differential - excuse me, final drive. Clues are it varies with road speed, not engine speed, and it changes with load. I defer to wiser minds as to what to do about it... I've had vehicles which did this their lifetime, and one old Dodge which whined for about a week and then spit the diff onto the pavement, oil, ring gear, and all.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Whining [message #332591 is a reply to message #332475] |
Fri, 25 May 2018 23:24 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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Stephen Thomas wrote on Wed, 23 May 2018 18:25Hi Folks,
It's been a while since I've driven the GMC and I think there's a new
noise. It sounds like a whine that bearings or gears might make. The pitch
goes up and down with the speed of the vehicle (not the rpm of the motor).
I start to notice it at around 25 mph and it gets a bit louder on the
highway. It goes away completely when I'm coasting. My friends think I'm
being paranoid. They can't seem to hear it.
I would think about the alternator. My coach whines at 2300 RPMs and up. Park. Put it in park and run the engine up and down. If you hear it, then do the shade tree trick. Get a broomstick, put it to your ear and touch the alternator, power steering, and water pump. Don't get it in a belt or fan.
Why haven't I changed the alternator? Because after a string of 5 that failed, this one charges the battery.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] Whining [message #332614 is a reply to message #332475] |
Sat, 26 May 2018 20:42 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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One other thought, since it's road speed variable, try turning under load and see if it changes as you load one front wheel and then the other.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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