Ever since I swapped out my rear end I've noticed this slight vibration. At first I thought it was the angle of my rear end but the angle is perfect. I really notice it mostly when accelerating and deaccelerating
You're not giving much info. I assume you did an AOD conversion on an 19XX Falcon before changing the rear end. At some point you probably had a driveshaft built or shortened. (I assume whoever did that also balanced it.) Changing rear ends might have affected the depth of the yoke in the tranny. I'm told it should be about 3/4 inch from bottoming when the car is sitting. Maybe it's too far out causing the vibration when it's stressed by accelleration/decelleration.