Hi, I installed heavy-duty helper springs made by Superior Industries to the rear leaf springs of my '61 DeSoto coupe. I bought them from JC Whitney (14BB1103N). My first reaction was something else, but now when they are settled down I too have positive to tell. Ad says, that "they improve traction and help stabilize vehicle for a smooth, comfortable ride".. "restore springs to original arc".. That's all true and now the car take curves fine without excessive leaning and the rear-end lifted up some amount with more erectness in appearance. So I can see better those fins in rearview mirrors... Has anybody else installed helper springs too? If so, I'd like to hear opinions. MTL FINland
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