Andy brought his Jeep over to investigate an odd noise underneath. It only happens briefly when decelerating and creates a noise that sounds like something metal catching something rotating, giving a brief buzzing noise. We thought we'd found it when we found the handbrake cable being very close to the front prop shaft, but after pulling it further away with some cable ties, the noise remained. Several other possible sources of vibration were looked at, but nothing stopped the brief noise. I'm wondering if there's a slight imbalance in one of the prop shafts, that resonates at certain RPMs when not under load from the engine.