2005 FXT EJ257 replacement with 2005 LOB EJ253

[Scubie Dad]

Hi Noobie here (silent member since 2017).

I have 2005 FXT with bad EJ257 (not turning by hand ). Fooling around with open-ended third car problems consistently is given low priority on honey-do list, and so rebuild likely to take weeks. BUT I have a EJ253 still running great in otherwise expendable 2005 LOB.

I'd like to use the "3" as a placeholder until I rebuild the "7." Have all accessories, etc. for both, and therefore no need to commingle any parts (both are EAT). I'm hoping that this will be a direct swap. Do I need to change out ECM's? What other things am I likely to encounter? Harness/connector issues? How can I make definitive verification that the replacement will slide right in?

I will visibly block off FXT hood scoop with "temporarily out of service" tape through the transplant period, so as not to imply any turbo activity.

Thanks for the help.

[Scubie Dad]

CORRECTION

The FXT engine is EJ255. Thanks.