Clunking during slow turn. - Team Camaro Tech
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post #1 of 9 (permalink) Old Jun 22nd, 18, 07:33 PM Thread Starter
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Clunking during slow turn.

My car has just over 150 miles on it now. Still kinda shaking it down. When I pulled it in my shop I felt a clunk that was in the rear area. I don't know why but my first thought was the front spring mounts. I have the factory 4 leaf springs with bolt on frame connectors. Compition engineering I think. I checked the three mounting bolts on the spring cups. They were not loose , but were not tight either if that makes any sense. So I took the drive shaft loose and the shocks too. Lowered the rear down in the front. I really didn't pay much attention to the speed nuts when I put them in because they were new. I popped One out and looked at it. It was just a pressed cone shaped nut. My feeling is that they stretched. I looked through my stash and found a original. It has an actual nut welded on it. So I ground down the cone on the reproduction ones and welded a grade 8 nut on it. I simply ran a bolt up from the bottom to hold the nut in place. Took 30 minutes to do all 6. Just something to keep in mind for y all high power builders. Pictures of cone shape verses nut original style.
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X-77 keith
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018
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post #2 of 9 (permalink) Old Jun 23rd, 18, 04:29 AM
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Re: Clunking during slow turn.

If you have a posi rear I would suspect the clutches being the source of the clunk.

Don
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post #3 of 9 (permalink) Old Jun 23rd, 18, 04:41 AM Thread Starter
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It was those goofy spring pocket nuts. All is tight and the clunk is gone.

X-77 keith
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018
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post #4 of 9 (permalink) Old Jun 23rd, 18, 04:54 AM
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Re: Clunking during slow turn.

Nice fix, but if you do hear a clunk again - it's most likely what Don suggested ^^

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post #5 of 9 (permalink) Old Jun 23rd, 18, 05:30 AM
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Re: Clunking during slow turn.

NOS pocket clips I have also are coned. GM part #378276 and are stamped "CIP". Repro clips are garbage.

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Last edited by Sauron67MM; Jun 23rd, 18 at 07:42 AM.
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post #6 of 9 (permalink) Old Jun 23rd, 18, 05:48 AM
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Re: Clunking during slow turn.

I had one that the clutches were only noisy when the rear was warm after being driven. Changed the synthetic lube to dino and the clunk was gone. Posi additive used in both fills.

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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post #7 of 9 (permalink) Old Jun 23rd, 18, 06:16 AM
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Re: Clunking during slow turn.

Good fix. Had the same happen to a couple earlier Camaro's owned.
I pulled out the rear seat bottom and drilled a 1 inch hole from the floorboard and installed regular lock nuts & washer with antiseize.
Problem solved.

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post #8 of 9 (permalink) Old Jun 23rd, 18, 09:43 AM
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Re: Clunking during slow turn.

Don, what is “dino” lube you refereneced above? Having the same issue after a100+ mile drive. Thanx
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post #9 of 9 (permalink) Old Jun 23rd, 18, 10:23 AM
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Re: Clunking during slow turn.

Quote:
Originally Posted by bwarren View Post
Don, what is “dino” lube you refereneced above? Having the same issue after a100+ mile drive. Thanx
Non synthetic gear lube. Dino means it is made from dinosaurs...

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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