Yeah the diff is howling like crazy at anything above 20mph.
To answer your question (I get at least one PM every two weeks about this very question
) I switched to the AC springs to get more height -that's the short answer. Long answer/opinion/rambling next. Ask yourself a couple of questions before deciding on the suspension lift. First, are you a rock crawler or are you an overlander? Two, what terrain do you encounter? Three, how much extra weight are you carrying? For e.g. I like to think I'm an overlander but as you can tell from some of my pics that I often go out with friends who are into tackling obstacles for fun and the terrain here is rocky in general, lastly I travel with approx 1000lbs over stock - between people, armor, water, fuel, camping supplies etc. I found myself at a disadvantage with a lower ground clearance to clear the 2-4ft boulders on some of these trails. At the time AC springs was the only clear option and it has worked well for me so far. However, today I feel a better option exists that I've recommended to a few people with good results- OME springs (HD or MD) and get Steve's (4x4design.com) HDPE or NX4's aluminum front spacers to get the additional lift. Keep in mind also that lifting has its other downsides too (high center of gravity, CV angles, alignment) so unless your usage dictates the height moderation is good.
For 90% of us my opinion is that we would need: Manual hubs, OME springs (with a 1" spacer if you chose MD instead of HD springs), KYB front struts, Bilstein rear shocks, 245/75/16 tires. That's a pretty good setup IMHO and Allof75's truck is a great living example of it. For the 8% that often play in the tough terrain and carry lots of weight I'd suggest a setup similar to mine i.e. like armor, 32" tires, AC springs, locker, bumpers/winch etc The last 2% in my mind can be divided half and half into those that want the looks and those that want to truly rockcrawl these trucks or perhaps both...the end result is about the same (lift wise anyway)
i.e. 6" SFD lift, big tires (34-37" have been fitted with trimming), SAS, lockers, armor, bumpers, winches etc.
Just my humble opinion...