Something scrapes - Team Camaro Tech
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post #1 of 23 (permalink) Old Aug 10th, 14, 09:23 AM Thread Starter
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Something scrapes

I am now at my wits end on this one. I have a 68 Camaro SS/RS convertible with a newly replaced 12 bolt posi rear for multi-leaf springs, multi-leaf springs with stock KYB gas shocks, Anson Sprint 15x8 wheels with 4.5" back spacing and 235x60x15 tires on the rear with 15x7 wheels in the front. I have frame connectors installed that hang down a little below the exhaust mufflers that are tucked up. My problem is when I drive the car and go over a dip something scrapes. It sounds like metal scraping the ground but when I put her on the lift there is not a mark to be found. The undercarriage has all fresh black paint on all frame pieces and the mufflers. It sounds like it is coming somewhere around the rear seat area underneath the car. The tires do come out a little in the rear top of the wheel well but there is no evidence of the tire hitting at all. I, along with 3 other people, have gone over the underside of my car with flashlights and nobody can find even the slightest evidence of anything hitting anything. It does it with just me in the car and a lot more often with 1 or 2 other people in the car. I have checked everything I can imagine. The new 12 bolt multi-leaf rear replaced the 10 bolt mono leaf rear that was in the car when I got it. Any thoughts on what to check next? I am trying not to just replace things if not needed. I can send pictures of rear wheels in opening and the frame connectors if anyone needs to see that. This is so frustrating that it keeps me from enjoying this beautiful car.
Thanks
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post #2 of 23 (permalink) Old Aug 10th, 14, 10:19 AM
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Re: Something scrapes

How far off the ground are the frame connectors? I would suspect those or the tail pipes, but the tail pipes look high enough to not have any contact. I would closely examine the rear part of those frame connectors to see if any paint has been scraped.

Good luck hunting!
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post #3 of 23 (permalink) Old Aug 10th, 14, 10:20 AM
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Al
 
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Re: Something scrapes

As the rear suspension moves is it possible that the drive shaft hits a muffler, an exhaust pipe or the x-brace? Should leave a mark on the drive shaft if so.


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post #4 of 23 (permalink) Old Aug 10th, 14, 04:33 PM Thread Starter
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Re: Something scrapes

The frame connectors are 4 1/2" off the ground and there is not a mark on them.
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post #5 of 23 (permalink) Old Aug 10th, 14, 04:34 PM Thread Starter
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Re: Something scrapes

The drive shaft shows nothing and I also lowered the X-brace with 2 washers to assure that it could not rub.
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post #6 of 23 (permalink) Old Aug 10th, 14, 06:00 PM
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Re: Something scrapes

Maybe it's an illusion, but the wheel/tire doesn't look to be centered in the wheelhouse ? Possibly an alignment problem with rear axle ?

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........
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post #7 of 23 (permalink) Old Aug 10th, 14, 06:07 PM
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Re: Something scrapes

Just an idea, don't know where your tail pipe hangers are at but where mine were located (not sure if it's factory placement or not) the bolts may scrub on your tire on the inside.

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post #8 of 23 (permalink) Old Aug 11th, 14, 03:37 AM
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Re: Something scrapes

I had the tailpipes rub the axle tubes only when the rear end compressed on mine. Front sides of the axle tubes where the pipes start to go up to go over them. Had to cut down the ends of the x-pipe so the entire muffler/tailpipe assembly on each side could be moved toward the front of the car about an inch.

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post #9 of 23 (permalink) Old Aug 11th, 14, 07:22 AM
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Re: Something scrapes

look for tire rub on top of rear inner fender
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post #10 of 23 (permalink) Old Aug 11th, 14, 08:05 AM
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Re: Something scrapes

Muffler hitting diff? Broken exhaust hanger? Axle hitting exhaust? parking brake cable tight?

I've had all those in the past year. Fixed one then another bit me. Finally have it all nice and tight.

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post #11 of 23 (permalink) Old Aug 11th, 14, 10:55 AM Thread Starter
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Re: Something scrapes

I have checked everything that has been mentioned. The thing is it sounds just like metal scraping on the pavement. It is not a rattle or a clunk. This is what is so baffling to me. That and not seeing any type of a rub, scrape etc. anywhere on the underside of the car. I will go back and check every suggestion again maybe i just missed something.
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post #12 of 23 (permalink) Old Aug 11th, 14, 11:00 AM
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Steiner
 
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Re: Something scrapes

Also check where the tail pipe travels between the leaf spring and rear quarter.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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post #13 of 23 (permalink) Old Aug 11th, 14, 02:51 PM Thread Starter
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Re: Something scrapes

I just checked again and I cannot see a single mark that might even remotely explain the rub sound. Here are a few more pics of the under side.
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post #14 of 23 (permalink) Old Aug 11th, 14, 04:38 PM
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Re: Something scrapes

I had another incident with my Chevy II where I had my shifter mounted through the tunnel. One of the bolts was rubbing my drive shaft. Don't know your configuration or set up but may look there as well.

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post #15 of 23 (permalink) Old Aug 12th, 14, 01:39 PM
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Re: Something scrapes

I agree with one of the other posters. I think 1 or both sides of your new rear end are not properly located in the center bolt hole in the axle perch. Looking at the rear tire pictures the back of the tire appears to be too close to the rear portion of the wheel well. You may want to check the clearance on each side or compare it to another similar Camaro. If you used the rubber pads this could be the problem
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