I don't know how to explain this but i'll try my best. i have a 4R70W Tranny in a 99 f-150 with the 5.4 i have 111,000 miles for a while now when shifting between 1st and 2nd it hangs up for a second then hits hard into second it does this again when shifting down to pass. it does this 99% of the time. if i let off the gas right when it is shifting it doesn't hit as hard i guess due to the low rpms but something is not right any one understand what i am explaining? i dont' know what it is called but no one seems to be able to help me with this. the only option they give me is a rebuild.

Thanks