Vette Registry | Driveline Clunk - Forums

Already a Member?

Welcome back! Access your account.

Not yet a Member?

Join our community! Registration is free.

Join Free

Forum List New Topic Reply Search Hide Signatures

Driveline Clunk

Posted: 9/16/07 5:33amMessage 1 of 6

Reply Quote

SEVETTE

Former Member

Send PM

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

Be the first to like this post
Sign In to Like this post

SPONSOR AD:: (Our Sponsors help support Vette Registry)

Driveline Clunk

Posted: 9/16/07 6:42amMessage 2 of 6

Reply Quote

deeboy59

Free Member

Send PM

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

Be the first to like this post
Sign In to Like this post

Driveline Clunk

Posted: 9/16/07 8:23amMessage 3 of 6

Reply Quote

Adams' Apple

Lifetime Member
Moderator

Send PM

Duncanville, TX - USA

Joined: 11/8/2003

Posts: 22720

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
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"

Be the first to like this post
Sign In to Like this post

Driveline Clunk

Posted: 9/16/07 6:48pmMessage 4 of 6

Reply Quote

smoke-m

Free Member

Send PM

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!

Be the first to like this post
Sign In to Like this post

Driveline Clunk

Posted: 9/17/07 5:41amMessage 5 of 6

Reply Quote

lukesvette

Lifetime Member

Send PM

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!

I had the same symptoms, although with an automatic...