Thanks for the input guys. Had to travel for work, sorry about the delay in getting back to this.
onesloryd: Thanks. Not planning to replace front bar now, but why did you do yours? What kind of results did you pick up, and what type of driving/load do you do?
Buck183: We'll be talking. After driving it for a few days on familar highways, I believe the shocks need replacing. Thinking about doing them first, with an adjustable type. Rancho probably. (Put Bilstiens on the burban, and while they improved everything and are very well made, they rode too harsh for me.) An adjustable alows for future improvements and a nice ride the whole time. Can you help with shocks?
Dock Holiday: Have air bags on the Suburban, and love them. Don't yet know if the X needs them for levelness. Trying to be conservitive with $$ (that amuses me as we are discussing an excursion bought to pull a Formula )
jafo: It's like yours, a 2000 PSD 4x4. Did you put the shocks on before the sway bar? And you still needed the bar? And yes, front springs are needed.
Wardey: Thanks. I've also been to Ford-Diesel.com, though they are losing their name due to a law suit.
mcollinstn: I'm confused by a couple of things. Wouldn't stiffening up the rear decrease it's likeness to fish tail? Therefore reducing oversteer, or increasing understear? Likewise, a truck with excessive rear sway in a sudden trailering lane change, would be more likely to loose control than one with little rear sway? I've enjoyed your posts over the past months, and learned a lot from you, but most of what you stated here is directly opposit of what I thought was true. Can you shed a little more light here?
1) With good shocks like ranco's or bilsteins, how important is a sway bar? Are they different fixes for the same problem, like a turbo charger and a super charger do roughly the same thing, but through differnt means?
2) German cars often have soft springs with strong shocks, to provide a comfortable ride and performance. Can this be done to trucks? I'll need more spring travel in the front, but drive 35 - 50,000 a year, and am leary of one-ton springs because I want a comfortable ride. Is anyone awear of after-market leaf springs that should be considered? What about "Velvet Ride" dampeners that bolts to the stock springs?