RE: 4WD Steering/Rock Crawling MOD?
im guessing (very rough here). you would need:
servo (preferably high torque!!) $30 upwards
servo 'Y' lead or something. $5
silicone diff oil (for rock crawling) $10
steering components $10
only very rough... i dont really know how much stuff in the USA costs, and it depends on what brand you get for different stuff. im guessing about $100 if you get a decent high torque servo. i think the electronics are done by just splitting the signal again, so all three steering servos get the same signal, although im not certain.