According to the AS information (accurate enough for this point), the Trang-Oul set has these gold boni:
Quote:Partial Set Bonus
+18 To Fire Ball (2 Items)
Regenerate Mana 15% (2 Items)
+13 To Fire Wall (3 Items)
Additional Regenerate Mana 15% (3 Items)
Additional Regenerate Mana 15% (4 Items)
+10 To Meteor (4 Items)
Complete Set Bonus
+3 To Necromancer Levels
20% Life Stolen Per Hit
+3 To Fire Mastery
+10 To Meteor
+13 To Fire Wall
+18 To Fire Ball
+200 Defense
+100 To Mana
Regenerate Mana 60%
Replenish Life +5
All Resistances +50
Transforms into Vampire
This means that, in 1.10, regardless of when you got the items, 2 will give +18 fire ball and 15% mana regeneration, 3 will give +13 fire wall and an additional 15% mana regeneration, etc. For this purpose, it doesn't matter if you have only 1.09 items, only 1.10 items or a mixture of the two. The same hold true for the complete set boni.
All full Trang-Oul sets transform you into a vampire in 1.10.
There are some other changes to the individual items, though. 1.10 Trang-Oul's Claws have +25% poison skill damage. If you found them in 1.09, they won't have this. 1.10 Trang-Oul's Girth has a green bonus of +40% cold resist if you have 2 items. If you found it in 1.09, it won't have this.
So if you found a complete Trang-Oul set in 1.09 and use these in 1.10, none of the individual items will change at all. They'll still have all the same mods as before. However, the gold boni on the set will change to the new ones for 1.10.