hi mate, look under you van and notice how the leaf springs are attached to the axle. what you need to do is cut the saddle bracket off the axle and weld it the under side of it then instead of the axle sitting under the springs they it sits on top of the springs.





On mine I bought some brackets off ebay for a mk2 escort and welded them on but kept the original brackets perfect to line up.

Also mine is a little different as I have added a extra leaf spring each side to stiffen the rear up and raise it 1"



The above pic is with the extra leaf springs hope this helps .