Thank you gents for the replies. Sounds like the 2.5" Skyjacker springs fit my needs, I want a soft and compliant ride, and Im willing to accept some float with lean in the turns. Flexiheep, how is it with the sway bar removed? I was just planning to remove mine for more flex offroad, since I had done that in the past with a 1986 1/2 ton Chevy with no apparent negatives. Any chance you have record of the part number for the front springs? I have been looking and Skyjacker has numerous part numbers to sort through, I guess they lift less with the Cummins weight. Edit: maybe its just SummitRacing has it confusing. Under application for SJA-200s, it says 1", 2" and 2.5" ???
The SJA-D200S is a 2" lift for the Cummins trucks. I also noticed there is a SJA-D200CS which is also a 2" lift for the Cummins trucks. There is a $20 difference in price. I would reccomend a 2" lift spring and maybe a slightly longer shackle (no more than +1") for the front to obtain 2.5" lift. I have the SJA-D400S on my truck.