is a 1inch drop going to shift my drive shaft enough that I will need to correct my u-joint angle's?

 

you want the pinion angle to be 0 degrees if you are driving on the street daily not much racing that will insure the least amout of loss and wear on the joints when crusing. How ever for drag the pinnion angle must be figured in the squat position to avoid wheel hop and reduce inital stress on launch. normally 1 inch of drop is not a big deal on a thirdgen. it is only about 2 deg diff in pinion angle.