I am in same situation for 2014. What did you do finally for PF withdrawal and Gratuity claim?
As per my understanding, PF withdrawal is like, moving fund from PF account to your savings account. I don't think one should pay US tax for that, even if the amount moved to your savings account during the US residence status.
Same should apply to Gratuity claim (which gets credited to your India savings a/c while you are in US with resident status).
But the final settlement pay check gross amount should be taxable in US, which may have credited to your India savings a/c while you are in US.
Let em know your experience.