they are called gas adjust because
they are an oil and gas combination shock
the gas is used as a spring to resist upward motion of wheel in relation to the car body in conjunction with a (howdya put it) softly??? valved oil cartridge
the oil is used to resist rebound action back down and damp any extra bounce at the harmonic resonant frequency what ever it be for you brake and wheel combo and is valved more agressivley in this direction
any gas in a sealed system that is repreatedly compressed and stretched heats up
the hotter it gets the higher the pressure and that harder the shock becomes
hence gas-adjust.
a gas adjust shock can not be left in a relaxed state
they allways expand to their longest length if not connected to anything.
(you could if so desired (and are looking for that Charles Atlas physique) measure how long it takes before fitting and note it down... many years later if its much quicker buy a new one the anti foaming agents dead or the valves are cactus)
they will raise the car a fraction when fitted but how much depnds on the shock and the weight of the body
when they arrive they will be tied with plastic webbing
leave it on until fitted then snip it off
saves a lot of beggering about
if the Gas adjust shock is wrong for your car you end up with quite a bucking ride due to them getting too hard once hot.
they do not work well if your car is on the bumpstops because there is not enough action to allow them to Gas-Adjust.
they were designed for light trucks i.e solid axle n cart springs
the density or quantity of the gas charge dictates the spring constant of the shock.
i.e this shock combined with your standard spring or torsion bar alters the spring constant of the system like a coil over shock would. certain combos combine to make an excellent ride others do not.
in general a different and better affect on ride than from a harder oil shock which will jar the teeth and blow ya headlight bulbs all the time
when you throw them away i think you are now duty bound to dispose of them properly i.e pierce under a heavy blanket to release the gas so they don't blow up someones incinerator
Dave