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C3 rear end grinding noise under torque.. (1/4)
 3/28/19 7:40pm
KTC3
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Keiier, TX - USA

Vette(s):
1969 C3, 350, Cortez Silver, Gunmetal interior, 68K miles


Joined: 3/26/2019
Posts: 1

Just started  getting a grinding noise on the rear end of my C3 when accelerating or under torque. When foot is off the accelerator the grinding noise goes away.  Any ideas out there what it may be?

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Re: C3 rear end grinding noise under torque.. (2/4)
 3/28/19 9:19pm
73shark
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Overland Park, KS - USA

Vette(s):
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: 549

Welcome to the forum. Most likely suspects would be rear wheel bearings or rear end differential gears.

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1973 L-82 4 spd

Re: C3 rear end grinding noise under torque.. (3/4)
 3/28/19 10:02pm
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: 19624

...or possibly the front diff mount. If it is bad, it can allow the diff to move upward under acceleration. 
Is the noise a growl/vibration, or a whine?


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Re: C3 rear end grinding noise under torque.. (4/4)
 4/3/19 5:29am
lukesvetteLifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.


Joined: 5/18/2004
Posts: 6810

If you hear a distinct clunk when you accelerate from a stop, the differential bushing coul be your culprit and if youíve never changed it, itís cheap insurance to try that first. Are they the original wheel bearings? Thatís a likely suspect also. Have you changed the differential fluid? If so and you are proper additive for the posi, that would be my third place guess. Good luck!!👍

|UPDATED|4/3/2019 2:29:59 AM (AZT)|/UPDATED|