Search
Search titles only
By:
Search titles only
By:
Forums
New posts
Search forums
Members
Registered members
Member Map
Current visitors
New profile posts
Search profile posts
What's new
New posts
All posts
Trending
Latest activity
New media
New Events
New review items
New Users & BDays
New User Announcements
Birthday Announcements
New classified ads
New showcase items
New classified comments
New showcase comments
Classifieds
New ads
New comments
Latest content
Latest feedback
Latest questions
Advertiser list
Search classifieds
Media
New media
New comments
Search media
Events
New events
Donate
My CCF
Toolbox
Mailing Lists
My Shop
Reviews
New items
Latest content
Latest reviews
Latest questions
Brands
Search reviews
Showcase
New items
New comments
Latest content
Latest updates
Latest reviews
Author list
Series list
Search showcase
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Members
Registered members
Member Map
Current visitors
New profile posts
Search profile posts
Menu
Install the app
Install
Reply to thread
Corvette
C1 and C2 Forum
1967 Coupe - Chasing Down Rear End Noises
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="Jcpstrat" data-source="post: 202957" data-attributes="member: 3034"><p>Happy Easter everyone.</p><p></p><p>In the process of doing shake down runs when it hasn’t been raining, I been hearing noises from what I though was the rear of the car that I didn't like. I think I've got them all taken care of finally but I thought I'd list them out in case it might help someone else.</p><p></p><p>Initially it sounded like something rubbing and I did find things:</p><ul> <li data-xf-list-type="ul">One of the mag wheels was barely scraping on a brake caliper. The vendor I bought them from sent me some 3/8” spacers that took care of that.</li> <li data-xf-list-type="ul">A piece of the tunnel insulation (underside), was rubbing on the front drive shaft U-joint. Re-attaching the insulation to the body clip solved that.</li> <li data-xf-list-type="ul">Both rear tires started slightly rubbing on the inside lip of rear fenders once suspension started moving as I began driving at speeds to make the suspension work. I hated to do this part but I very carefully sanded off probably less than a 1/16” from the inside fender lips. Nothing anyone can see and I can’t even feel the difference but that solved that rubbing noise.</li> </ul><p>Each time the noise(s) seemed to get better but there was still a rubbing sound that had a frequency the same as the wheel rotation but I could not see anything obviously wrong. I know these vintage years had a know issue with the clutch packs in the differential that usually could be cured by adding a special GM differential additive so I ordered (2) 4Oz bottles of the AC Delco differential additive.</p><p></p><p>The day before I got the additive, the noise turned into a clicking sound, about twice the frequency of the wheels and the car felt weird (like shuttered), when I tried to make a turn, at a slow speed or from a stop.</p><p></p><p>I drained some fluid out of the differential and added the 2 bottles of additive and then took the car out to a parking lot where I did about 6 figure 8’s, which is recommended to work the additive into the clutch packs. On the way home the noise got worse, the clicking was replaced by a heavier sounding "clunk clunk clunk”, even when going in straight line. It was loud enough that when I pulled in the driveway, my wife was outside and she could hear it. I was sick about it but asked her to stand on the other side of driveway and listen again. She did and said it was louder on the passenger side.</p><p></p><p>I pulled the car into the garage and put the back end up on jack stands. I took the wheels off, the brake calipers off, the rotors off and both of the half-shafts (axle’s) out. At this point nothing was connected to the differential so I started the car, put it in gear and everything was quiet as could be from the rear of the car. With engine off and transmission in neutral I turned the differential side yokes by hand and everything was smooth as could be but without simulating a turn neither of those things I did would probably work the clutch packs.</p><p></p><p>The noise is all gone now after putting it back together so I don’t know which these following things solved the noise issue but the car drives great.</p><ul> <li data-xf-list-type="ul">I replaced the passenger side half-shaft (including U-joints and flange). The flange was warped (0.032") when checked with a straight edge and there was 0.030" of end play in the U-joint cross, that fits into the flange. Also one of the caps of that U-joint was freely rotating in the journal of the half-shaft ... I guess just worn out.</li> <li data-xf-list-type="ul">I fixed the driver side parking brake shoe where the front shoe was engaged (could tell due to brake dust and polished inside of rotor where it presses against), and fixed the star wheel adjuster which was frozen solid in the collapsed position.</li> <li data-xf-list-type="ul">Car sat for 7 days with 2 bottles of the 4Oz special additive for the differential clutch packs after I had done a some figure 8's with it while waiting for me to figure out I needed to replace that half-shaft assembly. Maybe the additive really needed to soak into those clutch packs even thought the noise was present when going in a straight line.</li> </ul><p>Actually I didn’t feel like I had found anything serious enough to cause the loud “Clunk clunk clunking” but without doing anything, else the problem is gone.</p><p></p><p>I hope this info. will help someone else.</p></blockquote><p></p>
[QUOTE="Jcpstrat, post: 202957, member: 3034"] Happy Easter everyone. In the process of doing shake down runs when it hasn’t been raining, I been hearing noises from what I though was the rear of the car that I didn't like. I think I've got them all taken care of finally but I thought I'd list them out in case it might help someone else. Initially it sounded like something rubbing and I did find things: [LIST] [*]One of the mag wheels was barely scraping on a brake caliper. The vendor I bought them from sent me some 3/8” spacers that took care of that. [*]A piece of the tunnel insulation (underside), was rubbing on the front drive shaft U-joint. Re-attaching the insulation to the body clip solved that. [*]Both rear tires started slightly rubbing on the inside lip of rear fenders once suspension started moving as I began driving at speeds to make the suspension work. I hated to do this part but I very carefully sanded off probably less than a 1/16” from the inside fender lips. Nothing anyone can see and I can’t even feel the difference but that solved that rubbing noise. [/LIST] Each time the noise(s) seemed to get better but there was still a rubbing sound that had a frequency the same as the wheel rotation but I could not see anything obviously wrong. I know these vintage years had a know issue with the clutch packs in the differential that usually could be cured by adding a special GM differential additive so I ordered (2) 4Oz bottles of the AC Delco differential additive. The day before I got the additive, the noise turned into a clicking sound, about twice the frequency of the wheels and the car felt weird (like shuttered), when I tried to make a turn, at a slow speed or from a stop. I drained some fluid out of the differential and added the 2 bottles of additive and then took the car out to a parking lot where I did about 6 figure 8’s, which is recommended to work the additive into the clutch packs. On the way home the noise got worse, the clicking was replaced by a heavier sounding "clunk clunk clunk”, even when going in straight line. It was loud enough that when I pulled in the driveway, my wife was outside and she could hear it. I was sick about it but asked her to stand on the other side of driveway and listen again. She did and said it was louder on the passenger side. I pulled the car into the garage and put the back end up on jack stands. I took the wheels off, the brake calipers off, the rotors off and both of the half-shafts (axle’s) out. At this point nothing was connected to the differential so I started the car, put it in gear and everything was quiet as could be from the rear of the car. With engine off and transmission in neutral I turned the differential side yokes by hand and everything was smooth as could be but without simulating a turn neither of those things I did would probably work the clutch packs. The noise is all gone now after putting it back together so I don’t know which these following things solved the noise issue but the car drives great. [LIST] [*]I replaced the passenger side half-shaft (including U-joints and flange). The flange was warped (0.032") when checked with a straight edge and there was 0.030" of end play in the U-joint cross, that fits into the flange. Also one of the caps of that U-joint was freely rotating in the journal of the half-shaft ... I guess just worn out. [*]I fixed the driver side parking brake shoe where the front shoe was engaged (could tell due to brake dust and polished inside of rotor where it presses against), and fixed the star wheel adjuster which was frozen solid in the collapsed position. [*]Car sat for 7 days with 2 bottles of the 4Oz special additive for the differential clutch packs after I had done a some figure 8's with it while waiting for me to figure out I needed to replace that half-shaft assembly. Maybe the additive really needed to soak into those clutch packs even thought the noise was present when going in a straight line. [/LIST] Actually I didn’t feel like I had found anything serious enough to cause the loud “Clunk clunk clunking” but without doing anything, else the problem is gone. I hope this info. will help someone else. [/QUOTE]
Insert quotes…
Verification
Post reply
Corvette
C1 and C2 Forum
1967 Coupe - Chasing Down Rear End Noises
Top
Bottom
You're browsing as a
Guest
. Please register to receive all manner of go-faster benefits on CCF. Click
HERE
to login or register.