Hey buddy, is the differential held on with nuts on the sides or with shims? Well, if it's with nuts, you'll need a dial indicator to adjust it. Mark the ring gear in four places beforehand, with the pinion gear already assembled. Place the indicator on the differential housing and read it at the four marks. The measurement should be between 10 and 18 hundredths of a millimeter. Keep in mind that it will never read exactly the same at all marks, that's why it's 10 to 18. The ring gear isn't straight; it has some variation. If it's with shims, I can still help you...