Thnx for all the info, i am the same new to 4x4 driving and maintenance on gq patrol. Did take it out for muddy driving and now have oil leak from crank seal. i am attempting to do this myself as i was quoted $4,000.00 to do repairs as i was told the is a groove in shaft. So was wondering if anyone had a few tips for me on putting everything back as repair shop was going to charge me $300 to put it back together, all that was taken off was cover and pulleys and seal. I have bought a crank sleeve and new seal as i was told this would fix problem. thnx for any advice.