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Topic: Thumping/grinding noise in hard right turn

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Thumping/grinding noise in hard right turn (1/6)
 4/27/21 3:46pm
BillHanna
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Cana, VA - USA

Vette(s):
1975 Stingray 71 350 engine Flat top pistons Sniper fuel injection Hyperspark ignition Vintage Air air conditioning Borgeson power steering box


Joined: 7/3/2016
Posts: 256

The other day I made a hard right turn in a parking lot, and it sounded like a tire was rubbing against something -- made a thumping noise.  So today I checked the 1/2 shaft U-joints, and they all seem tight.  Then I took a hard right turn in the yard and it made a scraping noise -- sounded like the driveshaft rubbing on something.  No issues in a hard Left turn.

Lately when I start off, I can hear a faint whirring sound like a bad bearing or U-joint, and there is a slight vibration at speed.

I asked my mechanic this morning and he said it could be the diff clutches chattering.  He thought maybe a oil change with additive would help.

Anyone have and ideas about this? 



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Re: Thumping/grinding noise in hard right turn (2/6)
 4/27/21 9:41pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 19854

Posi clutches do not make noise if you are going straight....only when turning. The description sounds more like a bad bearing, or possibly the park brake shoes rubbing, or even the service brake pads. Noises drive me nuts...so many possibilities. I think I would jack the rear up, and see if there is any play in the hub bearings by grabbing a tire at 12 o'clock and 6 o'clock, push at 6/pull at 12 back & forth, and visa versa. In theory, there should be NO play. In the real world, there will be SLIGHT movement. If there is noticeable movement, you prolly have a hub bearing taking a doo-doo. If the bearings check out ok like that, then more sleuthing is needed.



|UPDATED|4/27/2021 6:41:41 PM (AZT)|/UPDATED|


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Re: Thumping/grinding noise in hard right turn (3/6)
 4/28/21 12:35am
73shark
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Overland Park, KS - USA

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1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 692

Maybe a rear wheel bearing. 



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Re: Thumping/grinding noise in hard right turn (4/6)
 4/29/21 8:36pm
DroseLifetime Member
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Solon, OH - USA

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1981


Joined: 10/14/2015
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I had the same problem.  First check to see if your tires are the correct size. Second have your alignment checked.  The car could have been in a wreck and not properly aligned. Mine needed front end work, the right tire was rubbing the frame and sounded just like what you described. Good Luck!



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Re: Thumping/grinding noise in hard right turn (5/6)
 5/2/21 12:46pm
BillHanna
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Cana, VA - USA

Vette(s):
1975 Stingray 71 350 engine Flat top pistons Sniper fuel injection Hyperspark ignition Vintage Air air conditioning Borgeson power steering box


Joined: 7/3/2016
Posts: 256

Drose said:

I had the same problem.  First check to see if your tires are the correct size. Second have your alignment checked.  The car could have been in a wreck and not properly aligned. Mine needed front end work, the right tire was rubbing the frame and sounded just like what you described. Good Luck!

The car was aligned earlier this year after I had the Borgeson steering box put in.
I looked inside the front tire wells, and could no sign of tire rubbing.

Thanks for the suggestions!

 



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Re: Thumping/grinding noise in hard right turn (6/6)
 6/4/21 5:13pm
rep69
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Suffolk, VA - USA

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1969 convertible 427 4speed


Joined: 7/24/2012
Posts: 131

I have a 69 that is having the same issue. After putting car on lift, there is play in the right rear tire.  Bearings are bad.  Having a tough time getting this issue fixed? Not many mechanics in my area that can work on older corvettes. 

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