the mondeo and rs2000 transfere box's arent as weak as people think.
most fail due to over heating which is usualy caused by low oil in the t-box.
my rs2k 4x4 took so much abuse and never went wrong, it was driven extremly hard all the time.
aslong as the oil level is kept where it should be and not run low it will hold up.
for the rs2k t-box that means 300ml
i know the mondeo version is different, mainly the power spilt.
the mondeo power split is 60/40 in favour of fronts as opposed to the rs2k 4x4 60/40 split in favour of the rear wheels.
as long as you make sure the wheels are turning before you plant it and dont launch the car hard from standstill or do burn outs it will be fine.