i just had two new front axels installed in my 2010 850 xp,and went to rocky mnt house with all my family and friends,first mud hole i hit the front tires were not turning,the dash showed the 4x4 was engauged but did not work,i checked the wires,fuses at camp everything looded good so i rode all weekend in 2 wheele drive only used winch two times.any idea on what i should check or change