[AWK]

You can use free ISIS DRAW.

Look at the mechanism at:
http://depts.washington.edu/chemcrs/bulkdisk/chem237A_aut05/exams_Final%20Key-Pink.pdf

[portugal]

I have worked the product (3-bromo-2-butanol) and the mechanism out now for both the trans(2R, 3R) and Trans (2S,3S), however i have come across 2 products for each of them becuase of the equla probability that the C-O bond will be broken on either side and i need to know which one of each two is the major product. How am i supposed to know that???

[AWK]

_{trans(2R, 3R) and Trans (2S,3S)}
wrong using trans - trans suggest double bond

i need to know which one of each two is the major product. How am i supposed to know that???

It is normal in the case of more symmetric compounds that both products are formed in exactly the same amounts

[azmanam]

@ AWK: agreed.

cis/trans is generally reserved for geometry about a double bond, and sometimes for relative positions in a cyclic system.  syn/anti is also generally used for relative positions in a cyclic systems, but it can also be used for net creation of 2 new stereocenters. 

And you are correct, you form a racemic mixture of two products, and both will be formed in equal amounts.

I didn't check your r/s nomenclature, but assuming you prioritized each substituent correctly, then a job very well done.