It's not the issue of it being coil sprung, it's the use of a radius arm link set up and then lifting it, you are then multiplying the forces on the track bar. A triangulated 3 link system would be more stable. I struggled a bit with DW on mine right after I finnished it, thankfully the addition...
I don't think anyone (DIY'r) has actually done this. I beleive the reason is that for about the same amount of rework you can use chevy pickup lift kit parts (for less money). I personally would go with the weldtec stuff because of the quality, but, it will be a fair bit more expensive. My...
I don't think Jeremy makes spindles for the 96-02 express...only the later ones. I do think that the earlier truck spindles (and maybe control arms too) fit the earlier express...so I think you have some options. try out some junkyard truck parts first to validate fitment.
If you can do the work yourself and control the cost then it changes this conversation a lot. If you are taking a 15-20yr rig in for $15k-$20k shop conversion then I can't see how you can rationalize that..
the allison swap is not something I'd recommend to anyone, it was a personal challenge for myself (I don't like to be told "you can't do that") and I'm super happy with the result, but, it's a massive commitment.
get a pressure bleeder...I played hell getting the air out of the abs module on mine and that's with having the gm tech2 scanner and running the self bleed function...those front calipers are huge...your bleed will have to be perfect.
I've never looked up what the backspacing is, it has to be a pretty good amount because on the 4wd F250's the lockouts stuck way out past the tire bulge and guys would shear them off on tree stumps..
that combination of size, lug pattern and offset is a tough nut to crack...you may be better off just having some re-hooped to 17x8...you'd have a lot better tire selection and you could tune the offset a bit.
I think Stockton Wheel still rehoops steel wheels