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Only when I am backing the car into my driveway I sometimes get a noise(knocking kinda ).I have replaced all the u-joints,and today when I did the main driveshaft I greased everything and it did it when I got home tonight.When driveing I don't hear it.Any sugestions...
Iam.Oh and when I had it on the lift I rocked the wheels back and forth ,no noise.
Iam.Oh and when I had it on the lift I rocked the wheels back and forth ,no noise.
Rick
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Lifetime Member
Send PMHOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
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.
Rick, it sounds like it might be your differential bushing where the diff bolts up to the crossmember.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
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
Yeah...what he said...
The front diff bushing is prone to causing a noise, and even a bump when it gets all squishy. Take a look at the very front of the diff, where the driveshaft bolts up. There is a two-part bushing there, and it will prolly be mangled up. Easy to change, tho.
The front diff bushing is prone to causing a noise, and even a bump when it gets all squishy. Take a look at the very front of the diff, where the driveshaft bolts up. There is a two-part bushing there, and it will prolly be mangled up. Easy to change, tho.
Joel Adams
C3VR Lifetime Member #56 
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Send PMManteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold
1975 L48 4 speed
When it's undetectable, except for a little noise, sometimes you just have to wait it out until it gets a little worse and becomes more obvious. Now that you are aware that something is developing, you should have no trouble identifying the source before it leaves you inconvenienced on the roadside. In the meantime, make sure your fluid level is up. Sorry, that's the best I can contribute.
Jimmy B.
Just can't wait to get on the road again. 
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I looked in my manual,and in the AIM and I can't find the bushing you all are talking about.Dose anyone have a picture of this bushing so I can see where it's located.
Thanks...Rick
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22715
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
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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Thanks Joel I know now what I am looking for.
Rick
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in Forum: C3 Engines, Driveline and Handling
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