Greetings, just about to venture along the path of swapping out my 2.0 Duratec (228579 miles!!) for a 2.5 V6 Duratec but have a few questions I need answering.
Firstly and probably the easiest one to answer, I want to run the 6 speed 'box from the ST220, is this possible?
If so is it just a case of changing clutch and flywheel?
Secondly, is the change over going to require the clocks as well as ECU or can I keep the original clocks?
Thanks in advance.

 

The first hurdle to your plan that I can see is the 6 spd does not have a Vss (vehicle speed sensor) instead it gets this information from the wheel speed sensors via the abs ecu using the data bus (Can).

Second, the ecu wiring loom is fairly well integrated into the car and does not separate as easy as a focus.

I am not sure on the dash but I suspect apart from the lack of vss it will be fine.

Ttv list there single mass flywheel for both the 5 and 6spd so clutch should be easy.

My opinion for what it's worth is any mk3 mondeo needing any work with the miles yours has is an economic wright off. But if you go for it they aren't that hard to wire up.

This is an st220

 

The mk3 mondeo zetec s from a 53 plate onwards comes with a 2.5 V6 and a 6 speed gearbox.

 

some pics of a zetec s mondeo I used to own.