1971 Fastback Trunk torsion springs source?

[Wolf]

Hi All:
Hope someone can help me find a torsion spring for the trunk lid on my 1971 Mach 1. It does have a wing so I would love to find a pair of thicker springs but will settle for the thinner ones if that is all I can find. One of my springs just snapped overnight while the car was just sitting. Any help would be appreciated.
Thank you

 

[TexasBoss]

Yes, the torsion rods for the trunk with rear wing are thicker as seen in this pic. I would recommend Mike from Motorcity Mustangs or Don at Ohio Mustang Supply to check their inventory for a used pair. Also, find a "how to" on this site to install. Requires a special tool or risk ripping your fingers when a rod lets go.

 

[machattack]

Yes, the torsion rods for the trunk with rear wing are thicker as seen in this pic. I would recommend Mike from Motorcity Mustangs or Don at Ohio Mustang Supply to check their inventory for a used pair. Also, find a "how to" on this site to install. Requires a special tool or risk ripping your fingers when a rod lets go.

View attachment 87191

I have a spoiler on my deck lid. The extra weight is just a bit to much for the lid to stay open. Its set on its highest load limit. So, maybe the bigger diameter would work better if you have a spoiler? Be careful as that spring will mess you up when it comes off.
For safety I installed a lock down shaft collar on the end of the spring to stop it from sliding out of the grove. Hasnt moved yet.

 

[roboconklin]

I have a spoiler on my deck lid. The extra weight is just a bit to much for the lid to stay open. Its set on its highest load limit. So, maybe the bigger diameter would work better if you have a spoiler? Be careful as that spring will mess you up when it comes off.
For safety I installed a lock down shaft collar on the end of the spring to stop it from sliding out of the grove. Hasnt moved yet.

NPD sells a light weight rear spoiler that looks exactly as OEM. I think you can use thinner springs. I don’t know how expensive or readily available the thicker rods are. Just another suggestion.

 

[73MustangCoupe]

I purchased the NPD spoiler. It worked out great. When I installed it, with both torsion bars, I could not get it to stay open. It had worked fine before I installed the spoiler. The torsion bars seemed to go in easy enough - not a big deal. It struck me, could they be installed incorrectly? Yup!!! I reversed them and the trunk lid pops and stays open just fine with the spoiler. So check and see if the rods might be reversed. I can make a difference.

 

[rcadd1ct]

I ditched the springs and followed Austinverts lead and fabbed up a bracket to use a gas strut.

My car is not stock so I don’t care about originality.