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

Suspension information

Thread Tools
 
Search this Thread
 
Old Jun 19, 2019 | 11:27 AM
  #1  
fred of france's Avatar
fred of france
Thread Starter
Instructor
 
Joined: Mar 2017
Posts: 145
Likes: 13
From: Epernay (France)
Default Suspension information





Hello all
I recently bought a 1992 convertible C4 Corvette
she has 76000 miles, and I have not paid too much
it is equipped with wheel and non-OEM tire
295 X 35 X 18
it is also equipped with coil over which I do not know the brand
these coilover apparently have no settings ??
I would like to dismount them to clean them but I do not know how to do ??
If you have any information, thank you very much
Fred
Reply
Old Jun 19, 2019 | 11:36 AM
  #2  
BLUE1972's Avatar
BLUE1972
Race Director
15 Year Member
Liked
Loved
Top Answer: 5
 
Joined: Oct 2008
Posts: 19,144
Likes: 1,667
From: Long Island
Default

Use spring compressors on the spring.

On some coil overs you can open the ball joint and drop the lower A arm.
The spring / shock combo will be shorter than the distance opened up by the A arm lowering. Use a jack under the A Arm to lower it. Then you can take it out.
Reply
Old Jun 19, 2019 | 12:32 PM
  #3  
daverulz's Avatar
daverulz
Racer
10 Year Member
 
Joined: Oct 2011
Posts: 388
Likes: 38
From: Madison CT
Default

First - those wheels look perfect on that car!

I don't think you need a spring compressor or to separate the ball joint. From what I understand, you can just jack the car up to put the wheels at full droop and remove it as if it were a normal shock absorber, then thread off the lock ring and spring perch using the coil-over wrenches to safely take any tension off the spring.
Reply
Old Jun 19, 2019 | 02:05 PM
  #4  
fred of france's Avatar
fred of france
Thread Starter
Instructor
 
Joined: Mar 2017
Posts: 145
Likes: 13
From: Epernay (France)
Default

Originally Posted by BLUE1972
Use spring compressors on the spring.

On some coil overs you can open the ball joint and drop the lower A arm.
The spring / shock combo will be shorter than the distance opened up by the A arm lowering. Use a jack under the A Arm to lower it. Then you can take it out.
Originally Posted by daverulz
First - those wheels look perfect on that car!

I don't think you need a spring compressor or to separate the ball joint. From what I understand, you can just jack the car up to put the wheels at full droop and remove it as if it were a normal shock absorber, then thread off the lock ring and spring perch using the coil-over wrenches to safely take any tension off the spring.
Thank you for your answers
first I would like to dismount this set without touching the spring to clean them, and understand how it works
I saw under the spring 2 nuts, what is it used for?
can the assembly be dismounted by dismounting the two bolts on the lower arm, and the nut at the top?
Reply
Old Jun 19, 2019 | 02:25 PM
  #5  
Tom400CFI's Avatar
Tom400CFI
Team Owner
Pro Mechanic
20 Year Member
 
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Default

Originally Posted by BLUE1972
Use spring compressors on the spring.

On some coil overs you can open the ball joint and drop the lower A arm.
The spring / shock combo will be shorter than the distance opened up by the A arm lowering. Use a jack under the A Arm to lower it. Then you can take it out.
That is not right for this setup.

Originally Posted by fred of france
I saw under the spring 2 nuts, what is it used for?
can the assembly be dismounted by dismounting the two bolts on the lower arm, and the nut at the top?
Bingo. You should be able to remove the assembly with the two bolts at the bottom, and one nut up top. It's possible (depending on how the spring/shocks are assembled) that the shock rod could come out of the top spring mount after you remove the top nut. For that reason, *I* would remove the preload from the springs with the two adjusting nuts under the spring, first. When the spring is unloaded, then I would remove the assembly from the car.
Reply
Old Jun 19, 2019 | 02:38 PM
  #6  
fred of france's Avatar
fred of france
Thread Starter
Instructor
 
Joined: Mar 2017
Posts: 145
Likes: 13
From: Epernay (France)
Default

Originally Posted by Tom400CFI
That is not right for this setup.


Bingo. You should be able to remove the assembly with the two bolts at the bottom, and one nut up top. It's possible (depending on how the spring/shocks are assembled) that the shock rod could come out of the top spring mount after you remove the top nut. For that reason, *I* would remove the preload from the springs with the two adjusting nuts under the spring, first. When the spring is unloaded, then I would remove the assembly from the car.
Thank you ,
if I understand well, it is better to remove the pressure of the spring before depositing all
I should find out how is compressed the spring to put it back after cleaning
Reply
Old Jun 19, 2019 | 02:50 PM
  #7  
daverulz's Avatar
daverulz
Racer
10 Year Member
 
Joined: Oct 2011
Posts: 388
Likes: 38
From: Madison CT
Default

Mark, measure, or count the threads before you take the pre-load off the springs, then you can put them back the way they were after the coilovers are cleaned up.
Reply
Old Jun 19, 2019 | 03:39 PM
  #8  
Hot Rod Roy's Avatar
Hot Rod Roy
Safety Car
15 Year Member
 
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
Default

There are a lot of mis-conceptions about coil-overs. The coil-over is a complete unit, and does NOT need to be adjusted or disassembled before removal. The two big nuts at the bottom of the spring are used to adjust the HEIGHT of the car, or the balance of the two coil-overs on that axle. The compressed length of the spring will be the same, no matter how you adjust those nuts. It's the load on that spring that determines the length of that spring. The spring is rated in lbs./inch of compression, and adjusting those nuts has nothing to do with the physical characteristics of the spring.

To disassemble the spring from the shock, removing the big nuts will normally relieve the tension on the spring enough that a spring compressor is NOT required.

Here's one of the chassis I built:
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-1

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-2

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-3

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-4

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-5

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-6

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-7

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-8

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-9

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
Old Jun 19, 2019 | 04:06 PM
  #9  
fred of france's Avatar
fred of france
Thread Starter
Instructor
 
Joined: Mar 2017
Posts: 145
Likes: 13
From: Epernay (France)
Default

Originally Posted by daverulz
Mark, measure, or count the threads before you take the pre-load off the springs, then you can put them back the way they were after the coilovers are cleaned up.
Originally Posted by Hot Rod Roy
There are a lot of mis-conceptions about coil-overs. The coil-over is a complete unit, and does NOT need to be adjusted or disassembled before removal. The two big nuts at the bottom of the spring are used to adjust the HEIGHT of the car, or the balance of the two coil-overs on that axle. The compressed length of the spring will be the same, no matter how you adjust those nuts. It's the load on that spring that determines the length of that spring. The spring is rated in lbs./inch of compression, and adjusting those nuts has nothing to do with the physical characteristics of the spring.

To disassemble the spring from the shock, removing the big nuts will normally relieve the tension on the spring enough that a spring compressor is NOT required.

Here's one of the chassis I built:
thank's for your response ,,
i think it is safe at you said to release the pressure of the spring before remove the assembly for cleaning , after marking and measure the position of the 2 nuts
This coil over installed semmed be an basic model installation ,, Vette is unconfortable on bad road ,,,, and too low
How can i do to return at an OEM height for standart use ?
Sorry for my writting , i am french !!!
Reply
Old Jun 19, 2019 | 05:03 PM
  #10  
Hot Rod Roy's Avatar
Hot Rod Roy
Safety Car
15 Year Member
 
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
Default

Originally Posted by fred of france
I think it is safe as you said to release the pressure of the spring before remove the assembly for cleaning
Let me be clear: It is NOT necessary to release the pressure of the spring before you remove the coil-over from the car.

Vette is uncomfortable on bad road ,,,, and too low. What can I do to return at an OEM height for standard use?
To reduce the stiff (harsh) ride, the springs can be replaced with spring of a lower spring rate. (Lower pounds per inch deflection)

To increase the ride height, adjust the big nuts on the bottom of the spring to a higher position on the coil-over. Adjusting these nuts will NOT change the ride characteristics of the car.

I built the chassis for the blue and the black cars, which are in Jonquieres, France:

Reply
Old Jun 19, 2019 | 07:41 PM
  #11  
BLUE1972's Avatar
BLUE1972
Race Director
15 Year Member
Liked
Loved
Top Answer: 5
 
Joined: Oct 2008
Posts: 19,144
Likes: 1,667
From: Long Island
Default

Just be careful, I removed a set of Coil overs from a friends Camaro which did not have any adjustments.

He stated they have no settings. I would remove the spring pressure and then remove the coil over,

As a replacement there are many adjustable coil overs that are available with many spring rates.
Reply
Old Jun 20, 2019 | 02:14 PM
  #12  
fred of france's Avatar
fred of france
Thread Starter
Instructor
 
Joined: Mar 2017
Posts: 145
Likes: 13
From: Epernay (France)
Default

Originally Posted by Hot Rod Roy
Let me be clear: It is NOT necessary to release the pressure of the spring before you remove the coil-over from the car.



To reduce the stiff (harsh) ride, the springs can be replaced with spring of a lower spring rate. (Lower pounds per inch deflection)

To increase the ride height, adjust the big nuts on the bottom of the spring to a higher position on the coil-over. Adjusting these nuts will NOT change the ride characteristics of the car.

I built the chassis for the blue and the black cars, which are in Jonquieres, France:
Originally Posted by BLUE1972
Just be careful, I removed a set of Coil overs from a friends Camaro which did not have any adjustments.

He stated they have no settings. I would remove the spring pressure and then remove the coil over,

As a replacement there are many adjustable coil overs that are available with many spring rates.
Thank's
Did you have an idea of the make and model of this coilover and where can i find whitch model of springs they are
Witch kind of spring must i install to have a most confortable car on little road of France ??
Reply
Old Jun 20, 2019 | 04:09 PM
  #13  
drcook's Avatar
drcook
Safety Car
Photogenic
Photoriffic
Liked
Top Answer: 1
 
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
Default

Fred, voici un traducteur anglais-français, et vice-versa. J'en ai utilisé un pour aider un gars du Québec. Beaucoup plus facile, de converser
il suffit de changer la direction de la traduction et il va vous aider beaucoup.
Vous changez la façon dont le traducteur va en cliquant sur le côté source (le côté gauche, a un point jaune à côté de lui) et en sélectionnant la langue

https://translate.yandex.com/translator/French-English

Guys, you can use the same translator, just change the direction the translation is going and it will help out a lot.
You change the way the translator is going by clicking on the source side (the left side, has a yellow dot beside it) and selecting the language

This is what the statement above looks like in French. I used a translator like this to help one of the board members from Quebec

Les gars, vous pouvez utiliser le même Traducteur, juste changer la direction de la traduction va et il aidera beaucoup.
Vous changez la façon dont le traducteur va en cliquant sur le côté source (le côté gauche, a un point jaune à côté de lui) et en sélectionnant la langue

If you run multiple tabs, then type out your response in English, then cut and paste it into the translator, etc. That way the folks here can follow the conversation.

Last edited by drcook; Jun 20, 2019 at 04:11 PM.
Reply
Old Jun 20, 2019 | 04:33 PM
  #14  
fred of france's Avatar
fred of france
Thread Starter
Instructor
 
Joined: Mar 2017
Posts: 145
Likes: 13
From: Epernay (France)
Default

thank you very much for this translator,, I usually use google translate , and it seems work ???
Reply
Old Jun 20, 2019 | 04:47 PM
  #15  
drcook's Avatar
drcook
Safety Car
Photogenic
Photoriffic
Liked
Top Answer: 1
 
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
Default

Le traducteur de Google ne semble pas faire paraître la langue naturelle et fluide, il ya des phrases qui ne sont pas les meilleurs. Il fait passer l'idée, mais semble un peu "étrange" si cela a du sens.
Reply
Old Jun 20, 2019 | 04:56 PM
  #16  
fred of france's Avatar
fred of france
Thread Starter
Instructor
 
Joined: Mar 2017
Posts: 145
Likes: 13
From: Epernay (France)
Default

Originally Posted by drcook
Le traducteur de Google ne semble pas faire paraître la langue naturelle et fluide, il ya des phrases qui ne sont pas les meilleurs. Il fait passer l'idée, mais semble un peu "étrange" si cela a du sens.
Really sorry ,

I apologize



Reply
Old Jun 20, 2019 | 05:05 PM
  #17  
drcook's Avatar
drcook
Safety Car
Photogenic
Photoriffic
Liked
Top Answer: 1
 
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
Default

Vous n'avez pas besoin de vous excuser. Comment voulez-vous savoir ? En fait, comment saurais-je si la traduction de ce site de l'anglais au français semble correcte ?

You don't need to apologize. How would you know ? In fact, how would I know if the translation from this site from English to French sounds correct ?

Last edited by drcook; Jun 20, 2019 at 05:06 PM.
Reply

Get notified of new replies

To Suspension information

Old Jun 20, 2019 | 05:09 PM
  #18  
ChumpVette's Avatar
ChumpVette
Safety Car
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2010
Posts: 4,564
Likes: 1,676
Default

How about we use some proper terminology for coilover pieces. Hat, sleeve and collar.
Reply
Old Jun 20, 2019 | 05:13 PM
  #19  
BLUE1972's Avatar
BLUE1972
Race Director
15 Year Member
Liked
Loved
Top Answer: 5
 
Joined: Oct 2008
Posts: 19,144
Likes: 1,667
From: Long Island
Default

Speedway Motors - speed shop has a lot of pictures of the coil overs as does Honest Charley speed shop. They can be found on the web.

This may give you additional information.


1
2
3






Part # 91645550

Speedway Non-Adjustable Coil Spring Spacer




$14.99




(14)

Modified, Stock Car





Show only Coil Spring Spacers
Show only Speedway Motors Coil Spring Spacers




Compare
Quick View






Part # 72146732

Pro Coil Over Conversion Kit, Non Adjustable




$449.99
$619.80




Universal Fit, Non-Adjustable Shock Adjustability

Ships Free
On Sale

Shock Adjustability: Non-Adjustable

Height Adjustable: Yes

Adjustable: No


Show only Coilovers
Show only Speedway Motors Coilovers




Compare
Quick View






Part # 2553253B

Speedway Coil Over Shock Kit 140 Rate, 13.1 Inch Mounted




$369.99




(2)

Universal Fit, 140 lbs. Spring Rate, Front Position

Ships Free

Spring Rate: 140 lbs.

Position: Front

Mounted Length: 13.1"

Shock Adjustability: Non-Adjustable


Show only Coilovers
Show only Speedway Motors Coilovers




Compare
Quick View






Part # 1061340CT

AFCO 1340CT Pro Touring Fixed Valve Coil-Over Shock, 4 Inch Stroke




$202.99
$219.99




(1)

Universal Fit, Twin Tube Shock Type, 4.00 Shock Stroke

Ships Free
On Sale

Shock Type: Twin Tube

Shock Adjustability: Non-Adjustable

Shock Body Material: Aluminum

Shock Body Size: Large Body


Show only Coilovers
Show only AFCO Coilovers




Compare
Quick View






Part # 1061350

AFCO Non-Adjustable Alum. Coil-Over Shock Kit, 5 Inch Stroke, 11 Inch Comp.




$469.99




Ships Free

Mounted Length: 14"

Shock Adjustability: Non-Adjustable

Shock Body Material: Aluminum

Shock Body Type: Threaded


Show only Coilovers
Show only AFCO Coilovers




Compare
Quick View






Part # 1061340

AFCO Non-Adjustable Alum. Coil-Over Shock Kit, 4 Inch Stroke, 10 Inch Comp.




$469.99




Ships Free

Mounted Length: 12.75"

Shock Adjustability: Non-Adjustable

Shock Body Material: Aluminum

Shock Body Type: Threaded


Show only Coilovers
Show only AFCO Coilovers




Compare
Quick View






Part # 721ALN4000K

QA1 ALN4000K Pro Coil-Over Conversion System, Rear, 175-350 lbs




$478.99
$561.80




Universal Fit, Rear Position, Eyelet Upper Shock Mount

Ships Free
On Sale

Position: Rear

Shock Adjustability: Non-Adjustable

Shock Body Material: Aluminum

Upper Shock Mount: Eyelet


Show only Coilovers
Show only QA1 Coilovers




Compare
Quick View






Part # 1061370

AFCO Non-Adjustable Alum. Coil-Over Shock Kit, 7 Inch Stroke, 13 Inch Comp.




$469.99




(1)
Ships Free

Mounted Length: 17.5"

Shock Adjustability: Non-Adjustable

Shock Body Material: Aluminum

Shock Body Type: Threaded


Show only Coilovers
Show only AFCO Coilovers



Last edited by BLUE1972; Jun 20, 2019 at 05:18 PM.
Reply
Old Jun 24, 2019 | 01:42 PM
  #20  
fred of france's Avatar
fred of france
Thread Starter
Instructor
 
Joined: Mar 2017
Posts: 145
Likes: 13
From: Epernay (France)
Default

Thank's for these info
This WE , i 've clean a little the front left side coilover
I've see this reference on the spring , do you know what does it mean ???
Reply



All times are GMT -4. The time now is 06:36 AM.

story-0
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-1
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-2
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-3
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-4
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-5
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-6
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-7
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-8
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-9
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE