Axle Measures
I know that on other forums, I've run across people looking for measures on the axle in order to do some brainstorming or consider feasibility. Here are some numbers, some just for reference, others for actually planning. If anyone wants any other measurements, I'll do my best. Hopefully this helps in some way.
A - Ball Joint - Ball Joint (center to center): 54 3/8"
B - Pivot Overlap (center of mounting bolt to center of mounting bolt): ~5 1/4"
C - Leaf Spring Centering Holes (center to center): ~38"
D - WMS to WMS: (measured when wheels were welded in place): 69 1/4"
E - Distance between pivots (center to center): ~7"
I took this measure after lining up the axles better than in this image. My line was to run a string lining up near ball joint, then near leaf centering hole, then far leaf centering hole, then far ball joint.
The major change in mounting these brackets is switching the front to back relationships vs 2wd. In other words, 2wd has the passenger arm towards the front with the drivers side arm behind. This must be switched so that the driver's side with the differential is mounted towards the front of the van.