All FreeBSD 9.0 and later installations come with GPT. You can use gpart(8) instead of the classic fdisk(8) and disklabel(8).
To remove existing partitions from a drive
gpart delete
gpart show
gpart recover vtbd0
gpart add -t freebsd-ufs -b BEGIN -s SIZE GEOM
gpart add -t freebsd-ufs -b 20971682 -s 18874240 vtbd0
newfs -U /dev/vtbd0p4
mkdir /transip
mount /dev/vtbd0p4 /transip
mount /dev/vtbd0p4 /transip