trany help

help needed w/my 7272 in my ramcharger it has stopped pullin in drive and 2nd just slips,it will go just fine if i pull it down in low(1st) and it changes out fine ,kickdown works ok ,reverce is okwhen i come to a complete stop it just slips til i pull it back to low and shift it manualy,I can slow down and coast around corner and as long as i dont come to a complete stop its ok. did i break a sprag or band? will it have to be completly torn down to replace if trhats what happened? any ideas?
Author: triggerbear