Composite spring, year differences
Thread Starter
Burning Brakes
Joined: Sep 2017
Posts: 1,069
Likes: 64
From: Belgium
Composite spring, year differences
Hey everyone
Is there a difference in a composite spring kit for a 63-77 and a 78-79?
They sell the kits on Ebay but for these different periods.
There is a $50 difference... (63-77 is more expensive)
I have a 77.
https://www.ebay.com/itm/1978-1979-C...wAAOSw2gxYtziU
https://www.ebay.com/itm/1963-1977-C...wAAOSw2gxYtziU
Is there a difference in a composite spring kit for a 63-77 and a 78-79?
They sell the kits on Ebay but for these different periods.
There is a $50 difference... (63-77 is more expensive)
I have a 77.
https://www.ebay.com/itm/1978-1979-C...wAAOSw2gxYtziU
https://www.ebay.com/itm/1963-1977-C...wAAOSw2gxYtziU
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,334
From: North of Toronto - Ontario
The bolt size for the differential is different but the glass springs tend to be the same
The prices that are on my screen is the same for those 2
Do a search for the TRW spring before committing, some people aren't real happy with the height
M
The prices that are on my screen is the same for those 2
Do a search for the TRW spring before committing, some people aren't real happy with the height
M
Last edited by Mooser; Jun 16, 2020 at 05:26 PM.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,114
From: Crossville TN
No composite spring was installed at the factory until 1978. Prior years were steel leaf springs. The 'extra' charge for those years is for the additional hardware needed to install the composite spring in place of the original leaf spring.
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,334
From: North of Toronto - Ontario
OK, I take it back
Just checked with muskegon brake (they are the TRW spring guys) and they do list two different spring widths 2.25 and 2.5
M
From their website
1978-1979 Corvettes were equipped with a differential cover designed to accommodate a 2.5” spring. The spring bolted to the cover using 7/16” bolts. The 1978 Anniversary Edition Corvette is the exception, as it used a 2.25” spring that bolted to the cover using 9/16” bolts. Please measure the width of your existing spring and note the size of the bolts before ordering.
Last edited by Mooser; Jun 16, 2020 at 05:27 PM.
Race Director
Joined: Mar 2017
Posts: 11,880
Likes: 4,468
From: Virginia
Stop! Don't buy a composite spring from eBay, unless you want this to happen to you!
https://www.corvetteforum.com/forums...igh-still.html
Buy a low-arch Van Steel spring, either directly from them, or a trusted vendor.
Also, do you have a source for that? I didn't think factory composite springs started until 1981, when all C3s got them.
https://www.corvetteforum.com/forums...igh-still.html
Buy a low-arch Van Steel spring, either directly from them, or a trusted vendor.
Also, do you have a source for that? I didn't think factory composite springs started until 1981, when all C3s got them.
Last edited by Bikespace; Jun 16, 2020 at 08:08 PM.
