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aka Duke of URL
4,815 Posts
Just an idea...

Helper springs (coil) are made for leaf spring applications where more stiffness/load capacity or allowance for weak springs is desired. They have u-bolts that fasten over the axle tube and the top of the spring rides on the bottom face of the frame rail. If more stifness is needed, you can insert rubber spacers to arrive at the stifness you need, or you can also insert AIR-LIFT bags for pre-loading the rear suspension.

The helper springs made to clamp over the shock tubes usually wind up damaging the shock valving. Actual coil-over shocks sound good if the coil height is adjustable for differing rates.

Personally, I would talk to someone like EATON SPRING and get the correct springs made for the application and buy a nice set of adjustable shocks.
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