Never found a solution, rear suspension clunk
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marc9889 (10-10-2018)
10-09-2018, 07:57 PM
#22
Le Mans Master
https://www.corvettecentral.com/c3-6...equired-582008
Does your car have these and are they installed correctly ?
Plus do you own an assembly manual for your 72' ? If not buy one as a great deal of information is inside. https://www.mamotorworks.com/Corvett...-1972-623622-1
Make sure you have the correct torque values and if using a thread locker reduce your torque 20%
https://www.cycleworld.com/2014/07/2...htening-torque
Hope this helps.
Does your car have these and are they installed correctly ?
Plus do you own an assembly manual for your 72' ? If not buy one as a great deal of information is inside. https://www.mamotorworks.com/Corvett...-1972-623622-1
Make sure you have the correct torque values and if using a thread locker reduce your torque 20%
https://www.cycleworld.com/2014/07/2...htening-torque
Hope this helps.
10-10-2018, 01:19 AM
#23
You poor guy.
I had this very same noise happen, and lived with it for a whole year before I replaced those brand new rear shocks that had come apart internally.
Shiny as they are, china made shocks suck.
your welcome..........
I had this very same noise happen, and lived with it for a whole year before I replaced those brand new rear shocks that had come apart internally.
Shiny as they are, china made shocks suck.
your welcome..........
10-10-2018, 09:52 AM
#24
Melting Slicks
Thread Starter
https://www.corvettecentral.com/c3-6...equired-582008
Does your car have these and are they installed correctly ? Yes
Plus do you own an assembly manual for your 72' ? If not buy one as a great deal of information is inside. Yes https://www.mamotorworks.com/Corvett...-1972-623622-1
Make sure you have the correct torque values and if using a thread locker reduce your torque 20%
https://www.cycleworld.com/2014/07/2...htening-torque
Hope this helps.
Does your car have these and are they installed correctly ? Yes
Plus do you own an assembly manual for your 72' ? If not buy one as a great deal of information is inside. Yes https://www.mamotorworks.com/Corvett...-1972-623622-1
Make sure you have the correct torque values and if using a thread locker reduce your torque 20%
https://www.cycleworld.com/2014/07/2...htening-torque
Hope this helps.
10-10-2018, 11:41 AM
#26
Instructor
I had a similar sounding issue in my '72 that I chased for quite a long time, and it turned out to be the pinion snubber. Not only was the old bushing worn out, the bolt and spacer were not installed correctly. It made an amazing difference in the overall feel (sold vs not-so-much), and the noise went away.
10-10-2018, 11:42 AM
#27
Instructor
https://www.corvettecentral.com/c3-6...n-front-582002
"Use only Rubber not Poly" on this joint.
"Use only Rubber not Poly" on this joint.
10-10-2018, 01:37 PM
#28
Melting Slicks
It seem the noise only occurs when the suspension is under compression. I understand the shocks are newer, but have a look at the upper mounts to ensure the bolts are tight and the rubber isolators are really there. I can't tell if you have a sway bar, but if you do, how about the mounts where they attach to the trailing arm....are the little rubbers OK there? Check and make sure the trailing arm bolt and shims are all tight at the frame.
OK, I went and read the original thread and understand you don't have a swaybar, so disregard all that crap....
How about the trailing arms, have you fished a magnet up through the end of it to ensure no loose bolts or washers are in there?
Those rubbers for the cross member should not have a gap like that. Are you jacking it up so it applies a huge side load? Something is fishy there. You might want to have a look at those, but I don't think that is your problem.
Some additional video would be helpful, Hope you find it!!
OK, I went and read the original thread and understand you don't have a swaybar, so disregard all that crap....
How about the trailing arms, have you fished a magnet up through the end of it to ensure no loose bolts or washers are in there?
Those rubbers for the cross member should not have a gap like that. Are you jacking it up so it applies a huge side load? Something is fishy there. You might want to have a look at those, but I don't think that is your problem.
Some additional video would be helpful, Hope you find it!!
Last edited by OMF; 10-10-2018 at 01:57 PM.
10-10-2018, 04:15 PM
#29
Melting Slicks
Thread Starter
It seem the noise only occurs when the suspension is under compression. I understand the shocks are newer, but have a look at the upper mounts to ensure the bolts are tight and the rubber isolators are really there. They are tight and isolators are there. I can't tell if you have a sway bar, but if you do, how about the mounts where they attach to the trailing arm....are the little rubbers OK there? Check and make sure the trailing arm bolt and shims are all tight at the frame. I do have an original sway bar and everything there looks good (in fact, the bar was off and I reattached it hoping it would take care of my problem, but it didn't of course. And the TA bolts and shims be tight
OK, I went and read the original thread and understand you don't have a swaybar, so disregard all that crap....
How about the trailing arms, have you fished a magnet up through the end of it to ensure no loose bolts or washers are in there?
Those rubbers for the cross member should not have a gap like that. Are you jacking it up so it applies a huge side load? Something is fishy there. You might want to have a look at those, but I don't think that is your problem. I jacked the car at the differential where spring attaches; I did have a safety jack on the pass side, just in case but little pressure from it
Some additional video would be helpful, Hope you find it!!
OK, I went and read the original thread and understand you don't have a swaybar, so disregard all that crap....
How about the trailing arms, have you fished a magnet up through the end of it to ensure no loose bolts or washers are in there?
Those rubbers for the cross member should not have a gap like that. Are you jacking it up so it applies a huge side load? Something is fishy there. You might want to have a look at those, but I don't think that is your problem. I jacked the car at the differential where spring attaches; I did have a safety jack on the pass side, just in case but little pressure from it
Some additional video would be helpful, Hope you find it!!
10-10-2018, 05:28 PM
#30
Racer
Thanks for the suggestion.
Just to catch everyone up, the shocks were new 1 year ago, new TRs, adjustable strut rods and half shafts 3 years ago, along with dust shields, turned rotors, brake pads, hoses and lines and rebuilt calipers. Will be checking out all the items suggested in the next few days ask time permits. Anxious to get into this. Thanks.
Just to catch everyone up, the shocks were new 1 year ago, new TRs, adjustable strut rods and half shafts 3 years ago, along with dust shields, turned rotors, brake pads, hoses and lines and rebuilt calipers. Will be checking out all the items suggested in the next few days ask time permits. Anxious to get into this. Thanks.
How much of a struggle was it to get the old ujoint out of the flange that bolts to the trailing arm...could you have slightly bent the flange? If not perfectly flat, it might clunk as it rocks on the fulcrum of the bend...
10-10-2018, 06:59 PM
#31
Melting Slicks
Thread Starter
"new half shafts"...I assume this included changing out the Ujoints...
How much of a struggle was it to get the old ujoint out of the flange that bolts to the trailing arm...could you have slightly bent the flange? If not perfectly flat, it might clunk as it rocks on the fulcrum of the bend...
How much of a struggle was it to get the old ujoint out of the flange that bolts to the trailing arm...could you have slightly bent the flange? If not perfectly flat, it might clunk as it rocks on the fulcrum of the bend...
I have a new line on the possible cause of my woes, should know later this evening or tomorrow. Hope I'm right....
10-12-2018, 10:42 AM
#33
Melting Slicks
Thread Starter
Due to some health issues, I haven't been able to get back to this, hope to this weekend. In the meantime, can someone tell me what size wrench I need for the bolt for that front differential mount? I need to get a special wrench for it. Thanks.
10-13-2018, 04:16 PM
#36
Melting Slicks
Thread Starter
I was a bit "shocked" and quite happy about this solution
Looking forward to helping others as I have been helped.
The following users liked this post:
kansas123 (10-15-2018)
The following users liked this post:
kansas123 (10-15-2018)
10-15-2018, 09:35 AM
#39
Melting Slicks
Well, I managed to get a wrench on the top of that bolt and was able to determine that it is tight, I gave it about another turn so that it's quite tight now. Also, the driver's shock top connection to the mount was a bit loose and so it is quite tight now. I mounted my Chinese camera up to take another road movie clip of the passenger side but of course the camera failed to work because....and I'll leave it at that because I am quite angry about. Moving on, tightening that shock made a world of difference and I'd say took care of 90% of the annoying problem. Thanks for all the help, I'll go away now and stop beating this dead horse.
Looking forward to helping others as I have been helped.
Looking forward to helping others as I have been helped.