Hey guys, I just bought this kick butt 14 bolt from a junkyard. The tag on the outside was missing. However the code on the axle tube was "RFHG0961". Also when I popped the diff cover it had a serial # on the ring gear "1 GM 3992484 11 41 3 77". Also it seemed that the ratio was 4.11 when I counted the turns. My questions are, what ratio does this serial # denote, does the 3 77 denote 3.77's? Also how do I tell if it is a gov-lock model? Also, as far as mounting this beast, I know I need the trick u-joint, but I need to know where to get it and what part #. Also the 14 bolt was out of a 78 3/4 ton, so I think the spring perches are cool, but what about the shock mounts? Anyway I know I have alot of questions, but any help you all could give me would be much appreciated. By the way my Blazer is a 76 K5. Thanks. If in doubt, gun it.