I blew up my carrier on my 12 bolt and want to find another. What are the differences in carriers they put in these axles? Large for 3.73 and up? Small for 3.73 and down? 3-Series, 4-Series? What dose this mean. Can someone take this bag of snakes and lay them strait for me. I need to find one so I can instal new gears, bearings, and such to get my truck up and running again. I miss her so much!