So what I'm taking from this is that the drive shaft angle isn't as important as the relationship to the angle of the pinion and yoke. So my angles being 17 and 11 show that I'm 6 degrees difference and the max allowable (but not ideal, being 1 degree) is 3 degrees. so i need to change either the transfer case by three degrees or the rear axle housing by three. if i remove the transfer case drop it will jump down to like 7 degrees of angle instead of eleven and i will need to drastically make a change. such as a cv joint. The only question left is if I remove the shims will it affect my castor angle? Or does castor on an alignment only refer to the front axle?