when i pick a note on the higher strings and use the tremolo, the lower strings vibrate, ruining the note. is that normal or does the tremolo need to be set up?
Pics of the trem?

TBH though, you really should learn to mute other strings with both, or at least one, of your hands [ie palm for picking hand, fingers/tips for fretting hand].
Sunn O))):
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- Ibanez S670FM w/ JB
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That's normal since your tremolo is for all the strings so just mute the lower string with your palm when using your tremolo.
ok thanks, i just needed to know that thats normal.
i´ll start practicing muting