Are you referring to the atmospheric 3.7 that ford replaced with a new 3.3?
I wonder how does those two compare in terms of performance and reliability?
NA 3.7 cyclone. The first gen Ecoboost 3.5 along with the 3.5 NA and cyclone where all designed together. For whatever reason, 3.7 and NA 3.5 don't suffer problems like the EB.
I'm guessing they don't suffer timing chain stretch because they don't have massive amounts of torque available early in the power band.
The 3.3 adds dual injection to the design, it's similar power in a similar band to the 3.7/3.5 so with factory tires I imagine it outperforms the equivalent 3.7 truck because the new trucks weigh so much less than mine.
Prior to COVID insanity, there were very large discounts on the 3.3 so it was high on my list of consideration as a replacement. Now with discounts gone, a 2.7 truck is a scant $1200 more or something equipped the same way
We'll see how my 3.7 tows the trailer 10,000km across the country this year. If it's fine, 3.3 might still be in the running.