mazda?

i put my 4 link brs on today and there off a mpv van so there non adjustable. my question is this i kept the rearend at the same angle and its a two piece driveshaft. Is it or was i suppose to change pinion?

That depends on how much pinion change you get through the travel. If it is minimal, then you are probably okay.

do i need to istall the pan hard bar?

yeah you do, or else the rear end would move from side to side, even the smallest bit would be annoying.

if its a parallel link then yes to the panhard. if its a tri link then no to the panhard.