Please could anyone answer the following:<br>1. How easy is it to unlock a back axel that's siezed in diff lock?<br>2. What may be the reason a front diff lock is not engaging?<br>3. Is it normal for there to be a problem with clutch slip when trying to move off on very uneven ground?<p>All these problems are on a 1968, U411.<br><br><br><hr size=7 width=75%><p>