Heat/AC vent question

I have A 2012 Ram 1500 crew cab . My question is my vents on the dash dont seem to blow as powerful as my journey they work but dont seem to have the same amount of force. I was wondering if anyone else has had this problem. Also in the back behind my seat there are 2 vents in the middle and i cant seem to get much airflow through either,the floor vents under the seats work fine. Any help would be appreciated thanks