There was a model change in 2003. My model was from 96 to 02. Hopefully they fixed the issue during the model change.
The redesign in 2003 sorta kinda fixed the issues of the earlier vans regarding alignment settings, along with other modernizing of the still old school design front suspension.
The big change pivoted around the introduction of the LS series GM engines to the vans, getting rid of the Gen 1 small block that had been around since the 1950s, I think. The 454/8.1 big block engines were also dumped along with the diesel option.
Getting rid of the big blocks and diesels allowed GM to make the engine compartment and doghouse smaller in the new generation vans. This gave a smaller doghouse and bigger footwells in the cabin and more room for suspension at the front wheels.
The new vans have longer control arms that are cast instead of fabricated from sheet steel. The allow for a taller spring and more length to the wheels so get more travel available with less arc path. They also moved to the sealed bearing hubs at this time and away from the double tapered roller bearing adjustable and greaseable older style.
The new upper control arms have larger bushings in the frame end, which turns out to be a big deal if you need to get more positive camber or caster because you can get offset bushings that give and extra 1 degree of camber. I think the adjusting cams also have more travel but am not certain on that.
The also seemed to go on a weight reduction quest as some of the frame parts are thinner and probably made of stronger materials to reduce weight, including "lightening" holes and cutouts.
Bummer is that in 2003 they removed the front crossmember centerpoint from the approved places to use a floor jack or lift. Probably thinner and has a huge cutout right in the center of it. Although not approved points, I do jack on the ends of the crossmember where it meets the other frame parts as it very strong there, it appears. I use a floor jack on each end and lift both sides together. It goes up and down with much better stability than jacking in the center ever did and it allows you to lift a side higher than the other before putting in the jack stands.
I think most of the the other changes were cosmetic, but it is possible the hydroboost showed up in 2003 also.