Anyway, I need to take this housing off,

and i've got it all loose and moving.
It'll come out around 5mm ~ 10mm but gets stuck.
It seems to be stuck from within the sump.
I'm SURE someone on toyspeed has stripped this bloody thing and I'd really prefer to save some hassle by not taking off the sump, especially if I didn't have to.
Is there something under the oil pump housing that gets caught on the sump? Must the sump come off? <- is my question.
Engine is a rear/mid sump 1jzgte in a jzz30 soarer.