I have a 2" leaf spring lift with 1 1/2" skid plate spacers. Just bought this Jeep a few months ago and trying to get vibration out of 25+ mph and above. (already changed rear drive shaft U Joints out and that help a whole lot). I think if I get the angle of drive shaft better may help even more. Do I need to change motor mount to drop skid plate down a little more, Maybe an 1" lower?