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Alright, I have to ask.

What is the difference in what you just described vs the old traction bars you bolted under the spring?



There isn't a whole lot of difference, except one thing.

The caltrack through the front bracket pulls DOWN on the front of the main leaf segment at the front. The slapper bar pushes UP on the front of the main leaf segment at the front.

Since this area is already trying to bend UP (and is the primary source of spring flex), the slapper bar is less effective. It basically makes a large portion of the spring segment "solid", but it doesn't fix the biggest area of bending (front main leaf right behind the front spring eye).

Also, since most slapper bars have a rubber snubber on them, the rubber compresses (no different the having the spring waste pressure/energy through flexing).

The caltrac is steel on steel, so there is very little flexing. As Monte pointed out, you don't want ANY flex in the system.