About a year ago I did the 08+ leaf spring conversion on my truck, with great results. For those of you that have questions about that, here is the install thread from when I did it:
Finally doing my 08 Leaf Spring Conversion
I've been reading some about the improved ride quality of the 2011 leaf springs. Here is an article I found about the 2011's:
First Look: 2011 Ford F-Series Super Duty - PickupTrucks.com Special Reports
In the article it sais:
The suspension has been tuned up, too. The shocks have new internal valve settings and the spring rates have been adjusted for better ride comfort. In 2008, Ford introduced its 3-plus-1 spring pack for both the diesel and gas trucks but the 2011 model SD pickups with diesel engines are setup with a new 2-plus-1 kit. Brewer said the 2-plus-1 setup reduces some of the spring binding from friction that drivers felt as a secondary impact after hitting road bumps. It also saves weight for improved fuel economy.
I've been looking for a set, and finally came across a deal on a set to try out. Found a 2011 F250 with very low miles, that had a dash fire.
Got them in today. There is definitely a weight difference. The 2011's have 3 leafs where the 2008's I have are 4-leafs each. Here are a couple of pics of the 2011 springs after UPS dropped them off today:
Will probably be the weekend before I get them switched out, but I'll update when I do.