I'm running Ford Super Duty locking hubs so I dont have the spring either.thanks for the info.i put them in mine and think they are worth it. Alot easier to install (especially on a trail at crappy angles with crappy visability), stronger, but they do cost a bit more. i havent had a regular one fail on me, but im easy on the skinny pedal. but while doing my 60 swap on my YJ i did notice that one of the regular spindle nuts had a fracture all the way through. thats probably unusual, but im glad i caught it.
One thing that i have noticed that is not often mentioned when discussing them is that stock style hubs with the springs pushing the flange towards the outside of the hub are a bit problematic. the springs rest on, or are to close to the stage 8 big lock ring thingie thats keyed into the spindle, instead of riding near the bearing on the hub, so the spring rubs up against it and makes a clicking noise. i really dont know what the long term affects of that rubbing would be, but i replaced mine with some warns that dont use that spring so i wouldnt have to be the guy that finds out.