Soon I`ll lift my body on my sidekick, to put some 31-10.5-15, is there something I should know before the work begins ;cables to change, fuel tank, brake lines...
   The lift is 3"

Brake perportioning valve. passenger frame rail just behind front axle.
Just move it up one bolt hole (it's held by two)
gas Filler hose can be adjusted or lengthen.
Shifters
Front brake line on drivers side going through fenderwell,
Drill another hole 2-3 inches below stock location and route through there.
Few wires on firewall can be readjusted to fit.
And a little fender trimming to fit 31"s

depending on what your 4 door has for acc. I had to loosen the clamps on the AC line over the rad. it now sits 3" above the rad. I also had to make new hoses from the PS resevoir down to the pump. Also need a few new vacuum lines from the firewall to the engine.

If you are getting the calmini bodylift paint the blocks before putting it in. They are bare metal.

And the front brake line relocation.