Greetings,
InI also was looking for an answer too this question, has the I tried searching it on google?
I'l post the info I find for the I later
Jah Blessings
One love
PS
also bro rootsridge, sorry I forgot to check out the Is radio, There was about 40 people in I house so it was a bit noisy, hopefully have some time this week
Posted on: 2007-11-06, 19:50:49
Greetings
Here bro I got a little off wikipedia, its not actually about the different tribes its about the sect, does tell a bit about it though

The Twelve Tribes of Israel is a Rastafari group founded in Kingston, Jamaica, and now functioning worldwide. Its founder, Vernon Carrington, was known as Prophet Gad, and taught ones to read the Bible 'A Chapter A Day'.
Twelve Tribes of Israel Rastafari organization accept Jesus Christ as Lord and Saviour, and Selassie I as the divinely chosen by the creator to represent him on earth. Due to the stigma associated with slavery and the false use of the name Jesus by enslavers/colonialist not practicing what they preached, some prefer to use the ancient names of Christ - Yeshua or Yehoshua or JAH SHUA ( from Hebrew ) and/or Yesus Kristos ( Amharic ).
Haile Selassie I is seen as a divinely anointed king in the lineage of King David and Solomon. While he is considered a type/representation of Christ in Kingly Character, he is not Jesus Christ himself, but a representative of the everlasting Davidic covenant, which is to be fulfilled by Jesus Christ when he returns as Conquering Lion of the Tribe of Judah.
The twelve tribes symbology is based on Jacob/Israel's 12 sons, and correspond to the months of the ancient Israelite calendar, beginning with April and Reuben. Some people further relate this to metaphysical signs. Thus Bob Marley came from the Tribe of Joseph, the eleventh of the biblical Jacob's twelve children (because he was born in February). The name levi in Ijahman Levi represent the third child whom was born to jacob. Another well known reggae group of this sect is Israel Vibration.
Bob Marley, a natty dread, by quoting a biblical text about Joseph on the album cover of Rastaman Vibration, was acknowledging his own support for this sect. Dennis Brown, Freddie McGregor, and many other roots reggae artists were associated with the Twelve Tribes of Israel.
Due to their inclusiveness of all races and acceptance of the Holy Bible, though not the oldest, Twelve Tribes of Israel is considered the largest of all Rastafari houses.
Sorry I copied but I'm sure the I won't take long reading this

, sorry if it isn't true, wikipedia isnt the most reliable source
hope I shed some light
Bless up