If you want discs then need to look for mid 2000s 3500 van. If you want a 14 bolt with discs then need one from a 2500 HD, 01 and up. GM didnt have a Silverado/Sierra HD in 99/00, they would be the semi float..
Ok, I’ll dig into it and see what I can find on that, info should be easier to find on it I’d hope. And on those vans, I’ve heard it can differentiate between passenger vs cargo and then different engines. Also heard towing packages make an impact too?