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[Kansas Law Dog]

I cannot offer much explanation to what you experienced when shifting from 4H to 2H. However, the automatic version of the FJ Cruiser is an electronic shift.

The transfer case is actually a direct drive (both the front and rear drive shafts turn all the time). The connection to drive the front wheels occurs through the front differential. The front differential is built with a A.D.D. (automatic disengaging differential) that is engaged when you have selected 4H and disengaged in 2H. Possibly the noise (buzz) was the electronic attempt to disengaged from 4 wheel drive, although I'm not sure why this would have been the case if you were coasting during the shifting event. I assume that when you say coasting to a stop, your foot was not on the brake, even lightly.

In any case, your method of shifting should not result in any damage to the vehicle.