Suspension lift for K30

[Bulldog]

You should get more than 4" of lift with the shackle flip. Measure the current shackle eye to eye and multiply by two, you should get between 5 and 6 inches of lift.

I haven't really looked at the geometry myself, but this is what I read from ORD's website:

"You may wonder why we don't have a Shackle Flip kit for more than 4" of lift. The reason is that to gain more lift, the end of the spring has to drop down twice the desired lift amount. In other words to gain 1 extra inch, we would have to drop the rear of the spring a full 2 inches. This drop at the tail of the spring can become a ground clearance problem and promotes roll-oversteer which is a handling problem in which the rear of the truck startsto feel "loose" under hard cornering with body roll. We've chosen the 4" lift height as the limit for these reasons"

They seem to say everything will be alright with the 6" HD shackles combined with the shackle flip. This would give me 5.5" of rear lift.