shock absorbers

[Hardus]

I know this might sound stupid, but wich side of the shock shows upwards?

[hardtailjohn]

Usually the ram will face upward. This keeps the ram from some of the crud, which can destroy the seals. If it's "hooded", you want the hood on top (biggest tube) so that any moisture, mud, or whatever will run down and off.
There are always exceptions to the rule!
JH

[68F250]

I don’t know if you can install any shock upside down unless it’s a mono-tube design. Normally on new non-gas shocks it’s a good idea to make sure they don't have air inside and bleed it out if they do. (Don't try this on old shocks. If they have air inside, it's from internal wear, and bleeding is not a cure.) With new non-gas shocks, bleed by holding each shock upright (installed position). Extend it, and then turn it upside down and compress. Repeat the procedure a few times and the new shock should operate smoothly, with somewhat greater resistance on extension.