Good catch, thanks. Why does it being from a 4x4 or not make a difference? Did they have different manifold designs to avoid hitting the crossmember or something?
Didn't someone recently state that the later 4x4 GMT400s (1994+?) came with the OE strengthening rods (that's my term for them... they might have been GM's attempt at a NVH improvement) on both sides of the engine that reach from the transmission housing / torque converter cover up to the front of the engine (to the engine mounts?), whereas the 2x4 GMT400s did not?
Regardless, would OP even care if these "rods" were or were not employed on the donor engine?
Maybe someone can shine some light on whether it matters.
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