Home page
SPONSOR AD

Support our Vendors!  |  Advertise Here

Topic: C3 rear thumping noise

in Forum: C3 Driveline Components


Already a Member?
Login
Not yet a Member?
Register for Free!

Back to top of thread

Our Sponsors help support C3VR
Re: C3 rear thumping noise (2/12)
 4/23/20 3:11pm
manchestersharkLifetime Member
Lifetime Member
Send Private Message

Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2382

Is P/S.  Propeller shaft?



______________


Click on image for full view

Re: C3 rear thumping noise (3/12)
 4/23/20 3:21pm
manchestersharkLifetime Member
Lifetime Member
Send Private Message

Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2382

IF you had the Drive/Propeller Shaft out of the rear, check to see if the end caps on the universal joint are properly seated in the pocket and the u bolts are tight on the caps. If you have side or up and down movement on the end of the propeller shaft, something is not tight, or not in correct placement.



______________


Click on image for full view

Re: C3 rear thumping noise (4/12)
 4/23/20 4:34pm
BillHanna
Standard Member
Send Private Message

Cana, VA - USA

Vette(s):
1975 Stingray 71 350 engine Flat top pistons Sniper fuel injection Hyperspark ignition Vintage Air air conditioning Borgeson power steering box


Joined: 7/3/2016
Posts: 319

Make sure that the tailshaft of the transmission is on a parallel plain to the input shaft on the differential.  If these are not parallel, there will be a vibration since the driveshaft will speed up/slow down with every rotation.



______________

   

Re: C3 rear thumping noise (5/12)
 4/23/20 6:50pm
ahmtoys
Limited Member
Send Private Message

West Chester, PA - USA

Vette(s):
1972 Base model convertible yellow white top black interior 350 4spd


Joined: 4/16/2020
Posts: 18

Thanks I plan on getting under the car this weekend and look. 

 

Re: C3 rear thumping noise (6/12)
 4/23/20 6:51pm
ahmtoys
Limited Member
Send Private Message

West Chester, PA - USA

Vette(s):
1972 Base model convertible yellow white top black interior 350 4spd


Joined: 4/16/2020
Posts: 18

MMM didn't think of that will check

Re: C3 rear thumping noise (7/12)
 4/23/20 9:49pm
Adams' AppleLifetime Member
Lifetime Member
Moderator
Send Private Message

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: 20126

Check to see if the spring end is hitting on the rim, or a wheel weight. You should be able to see wear marks if it is...



______________

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"

Re: C3 rear thumping noise (8/12)
 5/5/20 1:30pm
ahmtoys
Limited Member
Send Private Message

West Chester, PA - USA

Vette(s):
1972 Base model convertible yellow white top black interior 350 4spd


Joined: 4/16/2020
Posts: 18

Well guys thanks for all your help. 

I believe I did solve the issue, apparently when I had the local auto repair shop press in new universals on the 1/2 shafts, they had not properly secured the flange, needless to say it was bent at the top of the ears and this caused the thump at 180 degrees, the cap was not in line with the end of the universal and the retainer was not fully seated in the recess on the flange, I straightened the ear replaced the holding cap retainer with a new one test drove and all is fine so far.

Shame on me for thinking the local auto repair shop could do the job right. 

Re: C3 rear thumping noise (9/12)
 5/5/20 8:13pm
manchestersharkLifetime Member
Lifetime Member
Send Private Message

Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2382

Great!  I've been in that situation myself, and noticed the problem as I began the I installation.  Glad I could point you in the direction that I have encountered.  Be safe, drive it and enjoy it! 



______________


Click on image for full view

Re: C3 rear thumping noise (10/12)
 5/5/20 8:14pm
manchestersharkLifetime Member
Lifetime Member
Send Private Message

Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2382

Great!  I've been in that situation myself, and noticed the problem as I began the I installation.  Glad I could point you in the direction that I have encountered.  Be safe, drive it and enjoy it! 



______________


Click on image for full view

Re: C3 rear thumping noise (11/12)
 5/12/20 10:43am
73shark
Limited Member
Send Private Message

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: 864

manchestershark said:

Is P/S.  Propeller shaft?



I think it's Passenger Side. I first thought it was Power Steering until I read farther. 



______________

1973 L-82 4 spd

Re: C3 rear thumping noise (12/12)
 8/21/20 11:52pm
Plasticfreak
Former Member

Send Private Message

Hudson, PA - USA

Vette(s):
1975 T top coupe


Joined: 8/20/2020
Posts: 3

Problem solved?

Our Sponsors help support C3VR