A spacer will effectively lengthen the coilover. In the front that will increase the max angle of the tie rod and axle cv joint. Bigger angles are what breaks those parts. I don't know at what angle that will happen, but that is the risk with spacers.This has to mess with how the shock is designed to work. The preload is now way off and it will compress a lot different than designed. The traditional spacer seems a better option to me especially if you still want that smooth ride.
Lengthening the axle and tie rod will decrease the angle for a given travel distance. That is why you see long arm kits for IFS and why the Raptor is wider.
Increasing the preload of the spring will move the shock piston resting position higher in the shock body. Feedback says this results in a little firmer ride with less body roll and break dive. You will also lose some travel from rest on the rebound side, but gain it on the compression side.
Bilstein 6100 shocks for the Bronco have multiple positions for the spring perch. There is definitely some leeway there without putting the shock out of it's operational zone. How much? IDK.
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