I could not find a good figure for the physical/fixed drop measurement offered by the RC kit. But @e30dean Just did one on his 3/4 ton and said he thought it was unlikely that you could only net 4" of lift out of that kit.
I have seen elsewhere on the k1500 RC kit that that bracket is a 4" drop and you crank the next 2" to get the full 6" lift. But I did not see that stated anywhere as being true of the 2500 lifts as well.
Because I did not want a full 6" lift I went with the Tuff Country 14823 kit below with bilsteins. It was about 250 more than the RC kit with their steering stabilizer. And I got far better shocks so I thought it was worth it.
The TC kit is a full 4" bracket. I figure I will net about 4.5" out of it once I get a little preload on the torsion bars.
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That is the ticket! Any notes about the install or is it pretty straight forward?
Did you look at going with a rear shackle flip for the rear?