I was comparing a 96 to a 2000 truck. Both have a Dana 60 front axle with 33 spline outer and the same u-joint. The difference in outer stub lengths is just under 3/8". To be safe, upgrade to 2000 stub axles and hub assemblies, which will give you the slip on brake rotors. The only thing I cannot confirm is if there is any difference in caliper and caliper mounting bracket. If there is, the spindle will need updated to a 2000 part, too.
You're opening a can of worms.
Pre-99 has the rotors behind the hubs, calipers with the Allen head bolts that double as the slides, single big piston, no caliper mounting bracket, and ball joints in the knuckle (which I believe you just referred to as the spindle)
99-02 has the rotors that slip over the hubs, dual piston calipers that mount onto its own caliper bracket, that attach to a knuckle. They have the ball joints in the axle housing, NOT the knuckle.
What the OP should consider doing is getting the knuckles, hubs, rotors, calipers, outer axle stubs, and lockouts from a 92-97 F250 or F350, they are a direct replacement for the dodge knuckles and offer the locking hubs, simple tapered wheel bearings that you can adjust or re-pack, dual piston calipers, and
larger rotors.
FWIW I always run the cheapest possible rotor I can find :lolly: