I'm purchasing a 14 Bolt FF with a Gov Loc. The guy has 2 of these. Unit #1 - With the pinion held still, if you turn one wheel the other turns in the opposite direction, like an open differential. Unit #2 - If you turn one wheel, the other goes the same direction. You can't move one wheel independent of the other. He grabbed one, I grabbed the other and it was like we were trying to twist a spool. First question. Is one broken? Which is the proper operation for a Gov Loc? Second question. Do Gov Locs wear? What happens when they wear? How can I tell if it's worn out? Can they be rebuilt or is it even worth it? (Sorry, more like 4 questions in 1) Third question. I hear bad things about Gov Locs. This one will be behind a stock FI 454 and a Turbo 400. It won't be wheeled hard, mostly snow. Is this thing going to blow up and destroy my housing or will it work for what I'm doing. Thanks, and Happy Halloween! Eric M.