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Hello, thanks for posting
It's possible that one of the wheel speed sensor wires was damaged or stretched inside the insulation during the installation of the leveling kit, I would recommend getting a diagnostic scan tool connected and find out what specific code is stored in the abs/trac system, the 4x4 light flashing is because of the fault code, my best guess at this time is that one or maybe both of the front wheel speed sensors is not getting a signal to the computer.
I can be of a lot more help if I had that information.