If you drop the drive shaft then there is a specific procedure to re-seat the carrier/center support bearing.

Replace the driveshaft and guibos. Install the bearing bolts snug, not tight. Lower car to sit full weight on the wheels. Rock the car back and forth three or four times. If possible, tighten the bolts with car sitting on the ground, if not, then lift the FRONT of the car enough to gain access to the bolts.

If you split the drive shaft be sure to mark the halves and re-install in the same orientation to preserve the balance.

Good time to inspect the transmission mount while you are there.

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