My 2001 AC 300, with 4x4 and the three range manual transmission "jerks" and seems to slip on occasion. Its got low miles, buts it been used to pull heavy loads for years. I've been told to adjust the clutch. I'm a former drag racer and handy with tools; can anybody help with the procedure or advice on my problem? This 300 AC has been the hardest working machine...I can't beleive how dependable its been for 9 years, but the slipping clutch is driving me nuts. Thanks, machinefarmer.