The technical articles in this forum will be rated on the banana scale, of which you may already be familiar.  It has been slightly modified from it's original Canadian form, which can be seen at BC4x4.com!
Bananas Difficulty Examples
easy

 

 Spare tire change, oil change, battery replacement, windshield wiper replacement, minor tune-up stuff (adding fluids, air pressure).
moderately difficult Replace brakes, add tranny cooler, adding a stereo / CB, major tune-up stuff (timing, spark plug and wire changes, distributor rotor, adjust valve lash).
pushing the limits of a stock howler monkey; opposable thumbs only get you so far Axle replacement, bearing replacement, painting your vehicle, rebuilding a carb, replacing a water pump, minor body work.
requires the ability to communicate abstract ideas to other howler monkeys Major body work, drop-in engine replacement, third member rebuild / adding a locker, transfer case rebuild, front-end alignment
the job should only be attempted by a professional orangutan or well hung howler monkey. Complete engine rebuild, transmission rebuild, frame straightening