Newbie needs help – Hard Shifting Issue

Hello I am new to the UTV world and I am trying to help a friend with his 2013 xp900. He has been having issues when shifting from park/neutral to either reverse or drive. When he shifts it is real hard to get in gear and will grind when shifting. the issue just started a couple of days ago after he transported it on his trailer. we are not sure where to start looking any help would be appreciated.