NP246 T case spring updates

[usmcchevy]

I'm working on the transfer case out of my recently acquired 99 Silverado 1500. The truck has 220k miles on it and the clutch pack in the T case is smoked. I have found all the parts I need to rebuild it, but keep running across an updated return spring for the clutch pack. From what I gather, it allows the front drive shaft not to spin in 2wd like the early npo246 does. I also read somewhere the preload spring is not needed. Any insight or help will be appreciated.
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