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Topic: Driveline Clunk

in Forum: C3 Driveline Components


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Driveline Clunk

Posted: 9/16/07 5:33am Message 1 of 6
SEVETTE
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Downingtown, PA - USA
Joined: 5/7/2005
Posts: 3
Vette(s): 1978 Black T-Top L82 4-Speed 1998 Carmine Red Conv. 6-speed

Can anyone help on this one:

On a 1980 5-speed, posi rear, small block 350 When shifting from neutral into reverse or when engaging the clutch in first gear a pinging-clunk tales place. It is less noticeable if the clutch is feathered.

All U joints have been replaced, yokes checked, drive shaft removed several times and checked, drive shaft support bracket bushings and clutch replaced.

Any thoughts?


(moved post to correct forum)Adams' Apple2007-09-16 08:18:02


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Driveline Clunk

Posted: 9/16/07 6:42am Message 2 of 6
deeboy59
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visalia, CA - USA
Joined: 10/27/2006
Posts: 641
Vette(s): 1981 red with silver interior,350(L-81), 350TH, glass t-tops, aluminium rims, 1980 Black/ Black int., 350 GM crate engine/350TH, 1976 black/ saddle int., L-82 w/headers, holly carb, Hypertech ignition

On my '81 ,  one of the "clunks" it made was caused by a lose/worn  spindle flange.  At the time ,  I went ahead and greased the inner bearing with one of thse grease tools for such,  and then put a new nut on and re-torqued it.  The clunk was gone !  You might want to check  




Driveline Clunk

Posted: 9/16/07 8:23am Message 3 of 6
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20219
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
If it is not the u-joints, bushings, or spindle flange loose, it is most likely a posi problem. Try sucking out some of the diff lube, and adding some posi additive. Once the new additive is in, drive the car in tight circles left/right for a few minute to distribute the additive to all of the posi clutches.
You could also have internal diff gear wear, or even internal trans wear...
I'd try the diff fluid change w/posi additive first...


Joel Adams
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Driveline Clunk

Posted: 9/16/07 6:48pm Message 4 of 6
smoke-m
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baytown, TX - USA
Joined: 4/21/2004
Posts: 160
Vette(s): 1979 maui blue/doe skin, fuel injected 383, 6-speed manual, hooker sidepipes, 3.90 gear
It's your front differential mounting bushing. Replace it with a poly bushing and no more clunk!Thumbs%20Up


Driveline Clunk

Posted: 9/17/07 5:41am Message 5 of 6
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lukesvette
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HOWELL, 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.
Ditto on the mounting bushing!Wink  I had the same symptoms, although with an automatic...


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Driveline Clunk

Posted: 9/17/07 6:37am Message 6 of 6
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20219
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
[QUOTE=SEVETTE]...drive shaft support bracket bushings and clutch replaced.
[/QUOTE]

I'm thinking this is the front diff bushings...


Joel Adams
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