Hello, This is not a job for the mechanically challenged. It requires some special tools and the knowledge to use them. If the rear end is not set up correctly failure will result fast and it will make noise if the clearances are not all done correctly. Below are the basics of the answer to your question. But the operation does vary a little from one rear end to another. So if this is not the correct one for your truck, we will need to know the size of the ring gear in it now to get you the correct information. Thanks
Important: The ring gear bolts on the 8.6 inch, the 9.5 inch, and the 10.5 inch axles have left-hand threads. The ring gear bolts on the 11.5 inch axle have right-hand threads.
Notice: Do not pry the ring gear from the differential case. Prying the ring gear from the differential case may cause damage to the ring gear and/or the differential case.
Important: The mating surface of the ring gear and the differential case must be clean and free of burrs before installing the ring gear.