I like that you moved the front perch up along with mounting the sliders to the frame. It seems to have a negative effect on 60' when the spring gets tipped up at the rear mounting point and is not longer close to or parallel with the chassis centerline. I moved the front eye of the leaf spring into the upper hole to compensate for the extreme angle created by replacing the shackles with sliders welded to the frame. The idea of shimming to weights right is cool too.
