C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

SUSPENSION or WHAT

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Old Sep 10, 2011 | 01:03 PM
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Default SUSPENSION or WHAT

87C4 coupe---I have had the car for about 8 mo. now. Walking up to the rear of the car in the parking lot i noticed that it wasn't sitting right. The left rear is sitting lower then the right (about 2 inches higher on the right side (FENDER WELL TO TIRE). The front seems to be equal on both sides. At home the car is never parked on a level surface so i never noticed it before. No noises when i hit bumps. What should i start looking for ???
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Old Sep 10, 2011 | 01:30 PM
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Originally Posted by ken1950
87C4 coupe---I have had the car for about 8 mo. now. Walking up to the rear of the car in the parking lot i noticed that it wasn't sitting right. The left rear is sitting lower then the right (about 2 inches higher on the right side (FENDER WELL TO TIRE). The front seems to be equal on both sides. At home the car is never parked on a level surface so i never noticed it before. No noises when i hit bumps. What should i start looking for ???
hey, got that FSM yet?

shocks cause it, I have heard. when I removed my old Bilsteins, rr set up about 1" higher than before. I thought shocks were bottomed out, but got them loose at btm and they had plenty of travel.

jc
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Old Sep 10, 2011 | 01:39 PM
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Originally Posted by stoydido
hey, got that FSM yet?

shocks cause it, I have heard. when I removed my old Bilsteins, rr set up about 1" higher than before. I thought shocks were bottomed out, but got them loose at btm and they had plenty of travel.

jc
FSM---YES got one on ebay for $25.oo---took a while to find one at a good price
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Old Sep 10, 2011 | 02:44 PM
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Spin the rear spring around 180 degrees. This will tell you if you have a worn spring. Maybe the driver was 350 lbs. 25 years of fat will make a spring uneven.
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Old Sep 10, 2011 | 03:11 PM
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Originally Posted by 383vett
Spin the rear spring around 180 degrees. This will tell you if you have a worn spring. Maybe the driver was 350 lbs. 25 years of fat will make a spring uneven.
Can a 350lb. person fit in one these things?
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Old Sep 11, 2011 | 08:03 AM
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Originally Posted by ken1950
Can a 350lb. person fit in one these things?
Yes but you have to take the targa off. My son is also 6'7". He does have a problem with his size 15 clown feet fitting in the footwell.
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Old Sep 11, 2011 | 12:33 PM
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Originally Posted by 383vett
Maybe the driver was 350 lbs. 25 years of fat will make a spring uneven.
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Old Sep 11, 2011 | 02:15 PM
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Rear spring is cracked.

Not unusual. Many cleaning chemicals will degrade the composite material and cause it to crack since its always under some tension.
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Old Sep 11, 2011 | 02:41 PM
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Definitely looking at the shocks.

Just for checking, pull the left tire off and check to see if anything is bent. Who knows.
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Old Sep 12, 2011 | 12:16 AM
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Originally Posted by leesvet
Rear spring is cracked.

Not unusual. Many cleaning chemicals will degrade the composite material and cause it to crack since its always under some tension.
There was somebody that used duct tape to fix the problem.
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Old Sep 12, 2011 | 09:57 AM
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Originally Posted by PLRX
There was somebody that used duct tape to fix the problem.
The guy with the duct-tape wallet maybe?


Knowing this was an issue and having had the experience first hand, I was proactive this time...
I took my nice new hard spring and plasti-dipped it and coated the entire composite surface with the rubber coating. This protects it from any degreasers that I might use to clean the underside. Since so many automotive cleaners are caustic or acidic, the rubber coating prevents contact with the composite. So far there have been no issues. All it takes is one splash of certain common chemicals on the spring and it WILL crack...

Documented in a GM service bulletin from around 1989.
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Old Sep 12, 2011 | 02:15 PM
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Originally Posted by leesvet
The guy with the duct-tape wallet maybe?


Knowing this was an issue and having had the experience first hand, I was proactive this time...
I took my nice new hard spring and plasti-dipped it and coated the entire composite surface with the rubber coating. This protects it from any degreasers that I might use to clean the underside. Since so many automotive cleaners are caustic or acidic, the rubber coating prevents contact with the composite. So far there have been no issues. All it takes is one splash of certain common chemicals on the spring and it WILL crack...

Documented in a GM service bulletin from around 1989.
I can believe it. Most plastics will crack from acetic acid, common vinegar, also from many common household cleaners. Refrigerator liners in the test lab would crack like a pistol. Generally, it was small stress cracks, like the lines in one's brow.
"Releasing the stored stress from being formed into an unsual shape," in engineering talk.
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