It will effect the drivetrain angle. Not sure if it will be enough to cause vibrations though. U-joints from what I've been told need to to with ~2.5* of each other to not vibrate. Welcome to my world, this 6-spd is still vibrating on me.
Also, you wouldn't need to lower the subframe, just the nose of the diff, or the raise the ass end of the rear. Shiming the subframe down won't change the angle of the pinion flange and that's what you would need to do.
What I would be more concerned about is the angle of the subframe lands and the bolt that needs to pass through it. Being much shorter, that .25" will have more of an impact on the mount angle than the d/s angle
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-The Angry Stig-
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