Common issue with the AA NV3550 installation. Unfortunately too though, I'm not sure we've figured it out yet either.
Because some mounts are to one side, while some mounts are to the other.
I assume you've already tried loosening the engine mounts (if they're even tight?) to make sure what little teeny bit of flex you have available is being used?
And did you try flipping the cross-member side to side? It does not look like it's a-symmetrical, but I thought they said there is a specific way it goes in.
I'm sure others will point to what direction to take. But calling A/A in the morning would be my choice. Hmm, I forget if they're even open on Friday, but at the very least call early if you can in case they are open, but close early.
By the way, fantastic looking Bronco! I like the cream and blue combo. Is that Brittany Blue from Ford, or perhaps another, non-Bronco specific color?
Very nice.
Paul