Last weekend I upgraded the front Dana 60 and installed Yukon 4340 35 spline front inner and outer axles shafts with new Spicer U-806 u-joints w/o zerks. I also upgraded the hubs from the stock plastic junk to the new Yukon 35 spline Hardcore Hubs - they are super nice!
When I was upgrading the front axle shafts and hubs I noticed that the condition of the front springs were worse than I thought. The 2.5 year old Tuff Country 2" front springs were shot, in fact they had negative arch and I had almost no up travel left. So I replaced them with a pair of Skyjacker 4" C140S leaf springs. It's amazing how much better it rides now.