You'll need to put the 4x4 stuff back in or change the spindles to the 2wd versions. Without the front axle in place, the wheel bearings will separate when the truck is driven, as the axle nut both sets the preload on the bearing and is the retainer. 2wd spindles should fit up fine on the balljoints, consider using a pair from the '97-'04 4 ddor Blazer, they use a sealed bearing as well as a laerger rotors and a 2 piston caliper.
