im new to the wrangler. my previouse car was a 93 Chevy Astro. I need to know the grades of some fluids.,.. transfer case fluid, steering and suspension ball joint lubricate and gear fluid for manual transmision. Also, is it ok to use engine and transmission additives such as slick 50? Would you other Jeep Drivers recommend using 4x4 motor oil rather then regular when changing the oil? And is it ok to use motor flush when changing oil and other flushes when changing anti-freeze, ect.? Also, theres a spring under the hood that is connected to a wire and the wire linked to the gas pedal; it gives the car gas when pulled. the spring to it broken and hanging. whats is its signifigants?