HHOOOOLLY CRAP. So uh... Apparently what "3 inch springs gives the 4th gen PW a 1" to 1.5" lift" means is that "3 inch springs" give you a 4" lift. Read that again. I had to use a hi-lift jack to get the truck high enough to start. When I was done I let it down and it barely moved. My stock springs must have been super sagged out, because I don't think there is any way these Thuren springs are going to break in more than .75". I was looking for no more than 2", I really wants to keep the nose lower and have rake. Now with only my rack in the bed (200 lbs) I have a slight "California rake".
Current suspension setup and feel:
Front:
Thuren 3" springs
King 3.0 x 10.75" remote reservoir (Valved by King for application. Internal spacer removed for extra .75" stroke.)
Rear:
Stock Power Wagon leaves
Stock shackles
King 2.5" x 10" 2-tube Bypass
The suspension definitely feels sportier. I left my swaybar detached, and it feels exactly like I had my swaybar on with 5100's. Very nice feeling. In comparison to the front 5100's, the 3.0's have a softer entry feel to every bump but also compress less than the Bilsteins did, giving a smoother ride while also leaving me with more suspension to keep from bottoming. The rear 2.5's currently ride very bad. Something I did not think about until installation was that because the bump zone in the bypasses is roughly the last 4" of travel, this puts my unladen ride height very close to entering the bump zone. I can hit even small bumps and feel the rear is very harsh. This gives me a "jitter" in the rear which I think can be helped by opening the rebound tube. Overall, the truck feels like a monster now, in a good way. The semi-stock Valving from King is stiff, but smooth and comfortable, but also had a huge resistance to bottoming out. My springs I believe we're so sagged from my heavy bumper that I think their effective spring rate was actually much softer than normal on the Power Wagons. This led to a very comfortable ride. I believe part of my now stiff feeling front is from stiffer springs.

Driver front fender stock springs

Driver front fender new springs

Factory air box clearancing

battery box sits very close to the driver shock tower. 1/8" clearance. These may contact during hard driving.

Material removal from coil buckets. Long arms require less. After cycling with factory arms I determined that removing the inner lip was not enough and I had to get as close to the bolt hole as is safe. Then decided to do this clearancing around the whole perimeter, on both sides. Also had to grind my shock towers a fair amount. I made my own towers. Thuren/Carli setup probably require no clearancing of their towers but will require the same coil bucket clearancing. I used an angle grinder to cut the buckets and a die grinder to smooth the edges.

Shock angle, full extension

King 3.0 x 10.75" next to Bilsein 5100's. Also note my shock towers versus factory pintop towers
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