289 rear spring

[tnewland]

Hello Rick, just got back from vacation so I'm late to this thread. Sorry, but maybe I can still help. We talked at the last COCOA event at Willow Springs; I've got the BRG FIA CSX 7030. And thanks for the help with the T-5 tailshaft issue and muffler clearance situation.
Anyway, as you may know from our talk. I've also got spring issues. I'm currently on my second front spring (modified). So far so good. I have no plans to change it.
Just before Willow I installed a replacement rear spring from Shelby because the original just wasn't supporting the car through anything other than the flattest intersections. All too often the spring was slapping the gas tank hold-downs and bending them over. So far I haven't noticed any damage to the square tube above the spring.
Because I question the steel quality of the Shelby spring, I decided to beef it up to the extent that I could by adding the longest leaf from the original spring to the replacement spring. To keep the stack height the same, I removed the uppermost short leaf. On my car, there's only room for eight leaves. So far it's holding up.
Now for your situation: you might want to talk to (Shelby Dealer) Lee Benson at All Pro Motorsports in Pennsylvania @ 570-546-4800. He's tracking some cars and is going to a NASCAR spring supplier for replacements. I hope this helps. Tom