Been a bit since I last updated but I have some progress done.
Started to work on putting the 2016 rear springs in, the difference between the SD springs from 08 and up is they increased the length to provide a better ride, the obs springs were 25" front eye to center pin and 31.xx" center pin to rear eye. The SD springs are 33" front eye to center pin and 33" center pin to rear eye. At minimum you have to move the front hanger forward 8" to keep the axle centered and the rear could be left alone and just let the shackle take up the extra spring.
I decided to put in the superduty rear hanger and shackle as they a lot beefier then the obs ones and this way I didn't have to either trim the SD shackle to fit the obs hanger or cut up the obs shackle to fit the SD spring and the SD hanger moves the shackle back around an inch.
Here's where the old hanger sat and looked like.
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I reused the top left hole and drilled 3 new holes for the new hanger, it fits perfectly and it doesn't interfere with the bumper mounting at all.
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The old springs put in just so I could move the truck around.
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For the front I reused the obs hanger and moved it forward 8" and again reused the top left bolt hole of the old pattern for the new one. I also had to drill the hanger out to 3/4" to except the SD spring bolt.
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As you can see the spring is still centered perfectly and the SD overloads line up perfectly with the obs mounts (can't see it in this picture)
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They also switched the way the u-bolts go on the axle and the new bracket fits are axle with no issues.