[Cienzo1]

I believe that's either your tag axle solenoid or your drive diff lock solenoid.  This is what I would do.  Flip the tag axle (increase/decrease weight) and diff lock rocker switches by the driver seat and see if that stops the leak.  If the leak stops then I would exercise the switches a few more times and see if the leak stops after switching back to normal.  If it doesn't then I'd check what fittings are on the solenoid.  If the hoses have quick disconnect fittings you'll want to replace with compression fittings.  If it has compression fittings on it you may need a new solenoid.  I have replaced mine and they're not incredibly expensive.