You reused the old U-bolts?!? It is my understanding that U-bolts stretch (as all bolts do, but...) and should not be reused.
I ordered new u-bolts from Ford. They gave me square-bend u-bolts, but my Excursion uses "semi-round bend" u-bolts. I had no other option at the time other than to reuse them. They were visibly in good shape (no rust or rusted threads), so it as a judgement call I had to make.
I have new ones for the rear but need to get the correct part number for the fronts. I'll take care of this when I install the rear add-a-leaf in the next month or so.
What about the rears? What did you do for them? Are you using the "B" code ones?
I have not done anything to the rear springs, yet. I have a set of rear add-a-leafs that I will be installing and will be keeping the existing rear leaf springs.