C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Rear Monospring Not Fitting

Thread Tools
 
Search this Thread
 
Old Sep 10, 2023 | 03:16 PM
  #1  
a kungfu mastah's Avatar
a kungfu mastah
Thread Starter
Instructor
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Nov 2006
Posts: 197
Likes: 9
From: Jamestown Rhode Island
Default Rear Monospring Not Fitting

Hello everyone. I had to pull trailing arms out to fix some rust in frame. While everything was apart I figured I may as well swap squeaky leaf spring with a monospring one.

now that trailing arms are finally back in, im trying to get the spring in, and things just don’t need to lining up. I can’t even get the thing mounted flush to the differential. Thinking maybe one of the trailing arms could be pulling it forward?

anyone have any suggestions? I just want it moving again :<

thanks
Reply
Old Sep 10, 2023 | 03:37 PM
  #2  
calwldlife's Avatar
calwldlife
Team Owner
15 Year Member
Loved
Community Favorite
Top Answer: 1
 
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
Default

careful when using bolts INTO the diff.
couple holes will be blind and too long of bolts will crack diff housing.

and no to your question.

pics, which spring, and spacers?
Reply
Old Sep 10, 2023 | 03:58 PM
  #3  
interpon's Avatar
interpon
Le Mans Master
Supporting Member
All Eyes On Me
Liked
Loved
Community Favorite
 
Joined: Jun 2019
Posts: 7,649
Likes: 2,466
From: Indiana
Default

It can be a pain…jack around the arm and spring..be careful not to lift car..it will line up..
assuming the new spring fits..
details of springs? Pics?
Reply
Old Sep 10, 2023 | 04:28 PM
  #4  
a kungfu mastah's Avatar
a kungfu mastah
Thread Starter
Instructor
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Nov 2006
Posts: 197
Likes: 9
From: Jamestown Rhode Island
Default

I will get some when I go back to the garage in an hour or so
Reply
Old Sep 10, 2023 | 05:04 PM
  #5  
Bikespace's Avatar
Bikespace
Race Director
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Mar 2017
Posts: 11,931
Likes: 4,497
From: Virginia
Default

Please post pics! And mount the spring first, then add the bolts.

What year car, and details on spring? They are not all the same, unfortunately.
Reply
Old Sep 10, 2023 | 05:54 PM
  #6  
a kungfu mastah's Avatar
a kungfu mastah
Thread Starter
Instructor
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Nov 2006
Posts: 197
Likes: 9
From: Jamestown Rhode Island
Default

1978, and this spring https://www.ecklerscorvette.com/1963...-108659-1.html

and when looking for that I saw their kit has the heat shield things I was gonna ask about, and some other mounting stuff… does anyone know what those parts are? I did already get the longer bolts

havent forgotten pics, will be going over there soon

edit: so I have the actual spring, and the bolts on the side of the pic they have here
https://www.ecklerscorvette.com/1978-1979-corvette-monospring-kit-rear-composite-replacement-25-122870-1.html
Reply
Old Sep 10, 2023 | 06:13 PM
  #7  
bonesbrakr's Avatar
bonesbrakr
Burning Brakes
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Aug 2011
Posts: 830
Likes: 288
Default

Mount spring to differential first.
Do not use original mounting equipment. Use mounting equipment for the specific spring. Most likely the original bolts will be too long,
Remember to put in spacers as the new spring is 2.25" wide and the old one is 2.5" wide.
Reply
Old Sep 10, 2023 | 06:14 PM
  #8  
Bikespace's Avatar
Bikespace
Race Director
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Mar 2017
Posts: 11,931
Likes: 4,497
From: Virginia
Default

Send that back, and get the VanSteel low-arch spring instead. Direct from VanSteel if you have to.

What you bought matches the Hyperco/TRW spring, and is known for having a high-arch. The VanSteel low-arch spring is functionally identical to what VB&P used to make for our cars.

If you go to the VanSteel site, you'll notice that the spring you have isn't even listed. Perhaps they are ashamed of it.

https://www.vansteel.com/index.cfm?f...&subgroup=1955
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-1

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-2

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

 Joe Kucinski
story-3

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

 Verdad Gallardo
story-4

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

 Joe Kucinski
story-5

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

 Verdad Gallardo
story-6

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-7

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

 Michael S. Palmer
story-8

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

 Joe Kucinski
story-9

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

 Michael S. Palmer
Old Sep 10, 2023 | 06:23 PM
  #9  
a kungfu mastah's Avatar
a kungfu mastah
Thread Starter
Instructor
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Nov 2006
Posts: 197
Likes: 9
From: Jamestown Rhode Island
Default

****, been few months so doubt they would take it back :< sounds like old squeaky will have to go back in
Reply
Old Sep 10, 2023 | 06:28 PM
  #10  
Bikespace's Avatar
Bikespace
Race Director
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Mar 2017
Posts: 11,931
Likes: 4,497
From: Virginia
Default

Originally Posted by a kungfu mastah
****, been few months so doubt they would take it back :< sounds like old squeaky will have to go back in
Here's a long thread that shows the journey of discovery one Forum member took. In the end, Zip made good, and he got the "correct" spring for his car. Perhaps Eckler's would do the same.

https://www.corvetteforum.com/forums...igh-still.html

Post 163 really shows the problem.
Reply
Old Sep 10, 2023 | 08:07 PM
  #11  
Mooser's Avatar
Mooser
Race Director
10 Year Member
 
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
Default

If they wont take it back and if you can get the mounting figured out, the "hi-arch" spring (trw) may not be as bad as some are. I ran one for years with the car basically sitting at factory height. I did change recently to a van-steel low arch and dropped the car some while switching to different rims.
longer spring - trailing arms bolts are an option if you are running 17" rims as well
M

Reply
Old Sep 10, 2023 | 10:58 PM
  #12  
kansas123's Avatar
kansas123
Melting Slicks
15 Year Member
Liked
Loved
Top Answer: 1
 
Joined: Sep 2006
Posts: 2,810
Likes: 469
From: Wichita Kansas
Default

Absolutely mount the spring (only snug) to the differential before the spring ends. And definitely measure the length of the bolts needed before using the old ones or you will do damage to the diff case and hate yourself in the morning.
Reply
Old Sep 13, 2023 | 06:59 PM
  #13  
a kungfu mastah's Avatar
a kungfu mastah
Thread Starter
Instructor
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Nov 2006
Posts: 197
Likes: 9
From: Jamestown Rhode Island
Default

So update, managed to get the thing in, turns out one of the screws to diff was an old one throwing things off. So will talk to evilest about returning after I see ride height.

Either way I go, I’m still going to need the heat shields.it looks like van steel sells them, but they say to mount with existing hardware? How do I mount those things?

snd thank you for all the help everyone, still going through that huge post.
Reply
Old Sep 13, 2023 | 07:10 PM
  #14  
a kungfu mastah's Avatar
a kungfu mastah
Thread Starter
Instructor
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Nov 2006
Posts: 197
Likes: 9
From: Jamestown Rhode Island
Default

Originally Posted by Mooser
If they wont take it back and if you can get the mounting figured out, the "hi-arch" spring (trw) may not be as bad as some are. I ran one for years with the car basically sitting at factory height. I did change recently to a van-steel low arch and dropped the car some while switching to different rims.
longer spring - trailing arms bolts are an option if you are running 17" rims as well
M
the car is on stock steel rims. Bolts I got the 8” ones they said to get. Seemed every monospring said least 8l
Reply
Old Sep 13, 2023 | 07:35 PM
  #15  
Mooser's Avatar
Mooser
Race Director
10 Year Member
 
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
Default

Originally Posted by a kungfu mastah
the car is on stock steel rims. Bolts I got the 8” ones they said to get. Seemed every monospring said least 8l
8" would be normal, you can sometimes use slightly longer bolts as long as they don't go below the bottom of the rim... in case of a flat you don't need them digging into the ground

To your other question, the shield mounts using those 4 bolts you just fought with
M
Reply
Old Sep 13, 2023 | 07:39 PM
  #16  
Mooser's Avatar
Mooser
Race Director
10 Year Member
 
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
Default



Sandwiched between that spring plate and the blocks for the spring

I made this one from some cat-heat shield from a newer car at the wreckers. Used the spring plate as a template to drill the holes, mimicked the old TRW one I sold



M
Reply
Old Sep 15, 2023 | 07:19 PM
  #17  
a kungfu mastah's Avatar
a kungfu mastah
Thread Starter
Instructor
15 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Nov 2006
Posts: 197
Likes: 9
From: Jamestown Rhode Island
Default

thanks that’s really helpful, and the pics help make it much clearer. Been busy getting things set for hurricane coming. So just so I’m clear on the layers so I don’t have to take things apart again :>

differential
urethane bumper(1/8ish)
spring
another bumper(1/8ish)
Spacer (3/4ish)
mounting plate

First off is that order is right (think it is)
second when heat shield goes in

differential
urethane bumper(1/8ish)
spring
another bumper(1/8ish)
heat shield
Spacer (3/4ish)
mounting plate
Reply
Old Sep 15, 2023 | 07:37 PM
  #18  
Mooser's Avatar
Mooser
Race Director
10 Year Member
 
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
Default

This was the setup for my "TRW" spring. Not sure what yours looks like, this was old way they sold them


Installed



The shield goes right at the bottom of the spring mount stack. Just above the dogbone shaped steel mount plate right at the very bottom
M
Reply
Old Sep 15, 2023 | 07:41 PM
  #19  
Mooser's Avatar
Mooser
Race Director
10 Year Member
 
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
Default


M
Attached Images
File Type: pdf
TRW composite spring.pdf (253.6 KB, 307 views)
Reply

Get notified of new replies

To Rear Monospring Not Fitting





All times are GMT -4. The time now is 10:45 PM.

story-0
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-1
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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