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Topic: Rear End 'clunk'?

in Forum: C3 Driveline Components


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Rear End 'clunk'?

Posted: 4/10/04 11:09pm Message 1 of 8
C3RVETTE
Former Member
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Anacortes, WA - USA
Joined: 12/16/2002
Posts: 1293
Vette(s): 1979 Red #72 C3 Corvette,T-350,Black interior,air,tilt/tele,K&N.And a 1978 Olds Cutlass 350/350,auto,air,2-dr.,buckets
Rear End "Clunk"!
When starting cold,I have to wait for my '79 to completely warm up,& the RPM's to drop down to below 1200, or when I try to put it in reverse before then I get a loud -clunk!-sound.I'm not sure if its u-joints,or what?,and would like some suggestions.I've replaced a rubber "doughnut" thats in front of the rear end that helped some.I'm hoping I dont have to tear into the rear end or tranny.When its warmed up & idly normally,its noticeable,but barely
|cussing|


Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|

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Rear End 'clunk'?

Posted: 4/11/04 6:19am Message 2 of 8
Big Fish
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Joined: 12/16/2003
Posts: 630
It's funny how many posts I see here that I also see in the CF site! |biggrin| At least this is a TTT for you!


Rear End 'clunk'?

Posted: 4/11/04 7:05am Message 3 of 8
red70-oneconv
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Warrenton, MO - USA
Joined: 1/3/2004
Posts: 144
Vette(s): 1971; Numbers Match; Convertible; Red Ext.; Red vinyl Int; Black Conv Top; Red Hrdtop; 327-270HP; 4-speed; Factory Air Cond; Pwr Steer
I am afraid I cannot be of any help with your problem, however, I have a similar situation with my 1971. It has the 350/270HP motor and 4 Speed. Occasionally, hot or cold, I will have a "clunk" in the rear end when moving from a stop sign, etc. I hope someone can help.


Rear End 'clunk'?

Posted: 4/11/04 8:19am Message 4 of 8
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kstyer
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
Any play in the drive train will make a clunk, and it will be worse when the engine is on fast idle or revved up for any reason.
This could be play in the diff, any u-joint, mounting bushing, motor or trans mount, etc. The only way to know is to get under the car and start checking components. Wish I could be more help, but I would need more to go on.


Rear End 'clunk'?

Posted: 4/11/04 10:18am Message 5 of 8
C3RVETTE
Former Member
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Anacortes, WA - USA
Joined: 12/16/2002
Posts: 1293
Vette(s): 1979 Red #72 C3 Corvette,T-350,Black interior,air,tilt/tele,K&N.And a 1978 Olds Cutlass 350/350,auto,air,2-dr.,buckets
QUOTE|Big Fish said: It's funny how many posts I see here that I also see in the CF site! |biggrin| At least this is a TTT for you! TTT? Yeah,I visit about 6 vette sites,& theres alot of people looking for advice on the same subjects

|UPDATED|4/11/2004 10:18:14 AM (AZT)|/UPDATED|



Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|

Rear End 'clunk'?

Posted: 4/11/04 6:51pm Message 6 of 8
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kstyer
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
I'd love to say what I have seen on other vette sights, but I truly don't know, I haven't been there. Am I deprived? I like it here, and haven't felt the need. ( and I don't have the time |biggrin| )


Rear End 'clunk'?

Posted: 4/12/04 4:24am Message 7 of 8
GaryS
Former Member
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Moon Township, PA - USA
Joined: 12/3/2001
Posts: 42
Vette(s): 1972 Bryar Blue LT1 Coupe 1966 Rally Red Convertible (sold)
I will bet you that your problem is the rear differential mount. This is the rubber doughnut with the steel insert that mounts the nose of the differential to the chassis. Check your Assembly Instruction Manual (what? don't have one? go to www.ncrs.org - click on the store and order one for your car!) for the proper name of this. In the past it has been called the differential mount, snubber, etc. Almost all of the better Corvette catalogs have these and IIRC they are around $40 and take less than an hour to replace. This is a knuckle buster but anyone with simple tools can replace it. Very simple to do, simple tools, just expect to get dirty. Btw, when you jack your car up, please use safety stands.
Gary


Rear End 'clunk'?

Posted: 4/12/04 11:36am Message 8 of 8
C3RVETTE
Former Member
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Anacortes, WA - USA
Joined: 12/16/2002
Posts: 1293
Vette(s): 1979 Red #72 C3 Corvette,T-350,Black interior,air,tilt/tele,K&N.And a 1978 Olds Cutlass 350/350,auto,air,2-dr.,buckets
I'll see if I can get one of those,too,unless you're talking about a rubber piece I already replaced,which I stated above.I was already planning on getting new Spicer u-joints,also

|UPDATED|4/12/2004 11:36:10 AM (AZT)|/UPDATED|



Jon,-Majestic Glass Corvette Club-....Red #72,blk.interior,1979 C3 Corvette-TH350,Weiand,Holley,glass tops,Pioneer,3.55's,K&N,Dynomax,Flowmaster 40's,Energy Suspension,Spicer,VB&P(pics soon); 1978 Olds Cutlass Supreme 350/350,Dk. Blue 2-door Coupe-Hotchkis,PST,K&N,XM...'99 Mitsubishi Galant GTZ V6,black/grey leather,intake,strut bars,tint... |IMG|http://www.msnusers.com/cutlasscorvetteworkinprogress/shoebox.msnw?action=ShowPhoto&PhotoID=63|/IMG|

in Forum: C3 Driveline Components


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