Anybody Know of a how to book on rebuilding a 12 bolt rear end?

Mine is howling a little bit and I want to change the gear last guy had a 4:56 I'am thinking I want a 3:55 maybe a 3:73.

Thanks

I'm working on it. It isn't going too fast, but it is going. Ask any questions that you want right here. Do a search on this sight and you will probably find enough information to write a book. Look for the search button in the red bar at the top of this page.