they actually where still making the 1500s up until the half way mark of 1999 then discontinued really rare truck because instead of ppl ordering them they opted for the new body style that was available!
3" front 4" back I can see the confusion and my kit from belltech isn't a real noticeable kick out. Id rather have a little more function with my truck you know like being able to still go over good size speed bumps and steep incline driveways lol definitely wont want to go any lower
gl with the trans. when I started messing with my torsion keys PO had one side pretty much all the way in and the other most of the way out don't know how I didn't see it in the stance so I evened them out at about 1/4" from bottom of the cross member to the threaded side of the head of the bolt...
go with a kit probably best priced product is the belltech kits
http://www.belltech.com/products/belltech/complete-lowering-kits.html
if you don't want to go with a kit and wanted to get the parts individually (more expensive) you can see what youd need their also!
ive got my build truck done with a 3/4 belltech kit im definitely not a lowered kinda guy so I feel its a little lower then I wanted seen more then enough 3/4 lowered 400s in person to know thats definitely as far down as I would ever want. Kit came with spindles and coils in the front, shackles...