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Here is one picture, hard to see real good, but essentially you just need to support the open ends of the spring perch. They will crush (or curl might be a better word) on the rear open portion. Then the rear diff can go into positive pinion angle on launch.
My fix was a quick fix but what I did was use some 3/16" flat, and filled in the rear open portion. When I installed the ladders I left the spring perches on the diff.
Hard to see, but the rear perches are closed in on the ends. Keeps them from crushing.
The pieces I welded in was approx 2" X 2.5" X 3/16" flat.
See the rounded perch. The open end of the perch caved in allowing unstable and changing pinion angle on launch.
