Focus 2010 auto issues

[Chugalug]

Team Focus - just inherited a 2010 auto 2L petrol focus - 120K - with a 4 speed change. It has a slight but noticable change 'crunch' from 1st to 2nd and 2nd to 1st other wise runs well. The reading I have done says forks and actuators may be the issue to most likley needing a full auto-rebuild which they say is a 4K plus rebuild. As 2011 sees the 6 speed box introduced I am asking the question does a 6 speed box bolt straight up the 2010 engine and if that is a yes are then any sensors moficiations or other adjsutments required

all comments appreciated