I have a 77 Chevy Bonanza 4X4, 400ci, TH400, np203. Ok, first off I'd like to say that I've been having an ongoing problem of oil leaking out of my breather cap that was put on when my truck got it's Edelbrock carb, intake and air filter. For about the past year or so it's been leaking about 4 quarts between changes out of the breather cap. My mechanic checked all my engine seals and said they were good. His assesment was that maybe the engine is getting "tired" and he suggested that I put the original air filter back on, but I don't want to because an original has crappy air flow and just plain doesn't look as good. I also don't really believe that it's getting tired because it has 77,000 miles and has been taken care of pretty well aside from the occasional 110mph down a dirt road and crazy off roading down by the river So I posted on some chevy boards about this and they thought that maybe it was a plugged pcv valve. I haven't gotten around to checking this yet, but maybe tommorrow I will because I'm gonna be changing spark plugs and wires pretty soon because they are getting all fouled up from oil. I'm not a mechanic and don't know very much about engines so this will be interesting to check the pcv valve. I'd just thought I'd share this in case anybody else had any idea as to what the problem might be. Now the second part of my post deals with the full time 4X4 system that my truck has. I have a question because something I noticed contradicts what somebody on this board told me. They said that the full time system is not actually "locked" when I put the T case in 4WD. He said that it puts 50% to the front and 50% to the rear, but doesn't actually lock. But, strangely enough, when I'm on dry pavement and I turn a corner with it in high lock the wheels will chirp as though they are locked in. So what's the truth here? I checked the glove box for that G80 code and that other code for "gov-lock" and my truck doesn't have that.