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I need to replace a 3.5L EcoBoost engine. Will a 3.5 out of an F-150 pickup fit without modifications?
 

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As far as I have been able to tell the 2017+ F150 ECOBOOST 3.5 twin Turbo uses the same basic long block. It is probably best to find a Transit engine unless you want to swap all the accessories off or your transit to the F150 engine.
(Engine harness, ECM on the Transit is different than on the F150) F150 has the new 10R80 10 speed auto trans - so flex plate, and possibly starter could be different. Timing sensor on the back of engine and crank reluctor should be the same. They might have changed the oil pan, oil pick-up inside the pan, intake manifold, throttle body.

If you end up purchasing the F150 engine, put them on engine stands next to each other, and as you take them apart compare parts to see what is common. Eventually you will get the engines stripped to the point they look the same. Then take all the Transit parts you removed and put them on the F150 engine. Lots of work, but could be worth it if you purchase the F150 engine for less than you would a Transit engine. After you put the F150 back into your Transit, don't expect to have any more HP.
 
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