Welcome to the Corvette Forums at the Corvette Action Center!

Rear Suspension

69dream

Member
Joined
Jul 28, 2006
Messages
7
Location
MO
Corvette
1969 Lemans Blue Coupe
I am thinking of changing from the original leaf spring to a fiberglass composite spring. Anyone have any experience with this, and how did it turn out?
 
Joined
Aug 29, 2001
Messages
3,239
Location
Norcross, Georgia, United Stat
Corvette
2017 Arctic White Grand Sport
I did it and like it. I'm not sure I can describe it. The steel spring seemed to have a much more dramatic bounce to it when going over bumps where the composite spring is muc more subtle.
 

LVMYVT76

Well-known member
Joined
Apr 21, 2006
Messages
664
Location
springfield, mo
Corvette
1976 medium blue
I did it, but I also rebuit everything in the rear at the same time, including trailing arms, rear end, brakes, and parking brakes. This was a lot easier then with everything out. But, I think it wouldn't be a big job. Just put the car up on jack stands and "GET UR DONE".
 

GTR1999

Well-known member
Joined
Sep 4, 2003
Messages
1,146
Location
New Haven CT
Corvette
1969,1972,1975
There are pro's and con's to them. I only use steel on my cars and the aftermarket steel springs are not arched correctly.

Steel
Pro's
1- cost much less
2-look somewhat stock
3- last longer

Con's
1-Not arched correct- car sits 2" high with the stock 6.25 bolts
2- require 8" bolts to bring the bbody down.
3- 40 lbs heavier
4 rust if not painted
5- have to be radiused if used with a HD cover or the 4 mounting bolts hit and roll the threads.

Glass
Pro's
1- 8 lbs
2- handling is better- I think this is personal opinion
3-won't rust

Con's

1- cost 2-3 times that of steel
2-Break - main reason I won't use them
3-require new shocks valved for them or you'll be bouncing all over the road
4 still require 8" bolts to adjust the body
 
P

purpleRac3r

Guest
I have the VB & P dual mount spring. Wow, what a difference! Handling is noticably better - the glass spring seems to react much quicker than the steel. I have the QA1 single adjustable shocks to help fine-tune damping for my locally rough streets. Less weight is always a bonus in performance arenas. Changing the spring only took about 5 hours with basic tools (electric drill being the most advanced). As for steel, they can break, too. That's the reason I needed a new spring. I don't think breaking glass springs is a major problem or GM wouldn't haave used them exclusively on our favorite toy for the past 23 years. Your call - I can say the fiberglass front spring is next on the upgrade list on my '74!
 

Space Cowboy

Well-known member
Joined
Oct 8, 2003
Messages
408
Location
Houston Texas
Corvette
1968 Convertible - Candy Apple - 427/475+
I have one... It's smooth and you don't feel every bump in the road.
 
Joined
Mar 29, 2004
Messages
48
Location
Columbus, Ohio
Corvette
1972 White Coupe
I have had a fiberglass monospring in my 72 all summer. Prior to that I had an incorrectly arched steel spring that made the car sit high in the back (even with the 8 inch bolts). The fiberglass spring, in my opinion, rides much better than the incorrect spring I had prior. As space cowboy said above, it is a much smoother ride in my car.
 

69dream

Member
Joined
Jul 28, 2006
Messages
7
Location
MO
Corvette
1969 Lemans Blue Coupe
Did the fiberglass spring change your ride height? I believe my spring is original and has lost its sprung. I would like to raise the rear end about an inch or two from original ride height.
 

Space Cowboy

Well-known member
Joined
Oct 8, 2003
Messages
408
Location
Houston Texas
Corvette
1968 Convertible - Candy Apple - 427/475+
69dream said:
Did the fiberglass spring change your ride height? I believe my spring is original and has lost its sprung. I would like to raise the rear end about an inch or two from original ride height.

No... the ride height is exactly what is specified in the shop manual. It looked high to me, but after I measured it... it was on the mark.
 
Z

zgator

Guest
Didn't GM use composite type on 82's.I've got an 82CE but it has the gymkana option to they got the steel springs.Maybe Gm started in 81?Why can't we use GM composite springs?
 

Corvette Forums

Not a member of the Corvette Action Center?  Join now!  It's free!

Help support the Corvette Action Center!

Supporting Vendors

Dealers:

MacMulkin Chevrolet - The Second Largest Corvette Dealer in the Country!

Advertise with the Corvette Action Center!

Double Your Chances!

Our Partners

Top Bottom