Gundrak Heroic tips-

This is with a 540 defense warrior, 3x Elemental shammies, 1x Resto shammy. Successfully cleared Gundrak heroic 3x without wipes.

1.Slad'ran - Serpent boss - pretty much tank and spank - keep your casters at max range or the venom AOE will wipe you. I used elementals and thunderstorm on the adds. I DPS'd thru the 'cocoon', YMMV.

2. Drakkari Colossus - Elemental boss - Stone form is EZ. Save bloodlust for Elemental form. When he goes elemental, Ignore the puddles, they do minimal damage. 4x Healing stream plus a chain heal once in a while will take care of it). Also, split up when he starts barfing as he will charge through your guys. He will go back to the tank so don't bother trying to reposition targeting (as he ends up behind you when he charges). Also, when it seems like you've killed the Stone form, he will go back to Elemental once last time.

3. Moorabi - tank and spank. Try to interrupt his transform. Get ready to mass chain heal when he does the quake.

4. Gal'darah - I had trouble with this guy the first time. His knockback is annoying as a multiboxer (it also hits sideways). What you should do is find a corner where you can wedge your guys (where the Rhino mobs are before the boss is a good spot, by the torches on the side). Make sure your guys are wedged in so they can't move sideways or backwards. Pretty much tank and spank - max range in human form, group up in Rhino form - have your tank come to you. Spam heals on the tank and chain heal if your others need healing.

I finally cleared this on heroic after coming back with like 28k like on my tank. The final boss can really lay on the hurt! Anyway, my strategy is to wedge my guys into the spear rack on the right side in hopes they don't get thrown out of it. I tank the boss near to them, blowing heroism on the first transformation. It's important to get the rhino near the group ASAP! Like, almost on top of! You must have your back to your group so he throws you INTO them and not away from. If you manage to keep the healing going through this it's going to go down, but that's a big if...

On heroic mode there is one more boss -> Eck the Ferocious you must burn him fast because he got enrage and spread out because his spits can kill you :) and when he drops aggro just taunt him. :)

make sure you wait for him to target someone before you taunt (that or just start dpsing him on tank) otherwise it seems like taunt does nothing, at least for a paladin. Also I found it easier to keep everyone close and just pewpew and then chain heal if he pukes on your dps, of course having your tank face him away from group.

On Eck, I put my team in a corner in the room above so the boss can't get behind them and they keep dps up.

With Slad, keep in mind the constrictors don't cross water.

in the room above?? Do you mean the room before?

edit: also the snakes don't go in water? Do they get hit by poison AE if you position them there?

For the snake boss, it's incredibly easy if you simply sit the DPS at the top of the ramp by the zone-in and then pull him all the way up top. The snake spawns will take a really long time to make it up there. You'll have him sub 50% before the first snake finds its way up to you. The snakes still come, though, and they are hard to get aggro on over the healer using this method, so if you do it this way make sure you burn him down and pop heroism and trinkets early.

Ever since I started to pull him into the bone part (park DPS/Healer on the top of the bones, and tank at bottom of it) I have not had any trouble at all with Slad anymore.

Edit: For Moorabi: Now that I no longer have a problem with this guy and my gear is still the same as before this is what I do. 4X Healing Stream totems and attempt to keep him in Troll form. If you can't its still easy just go all out DPS on him (Save Bloodlust/Heroism and Elemental Mastery for this phase). Make sure your tank has full health for this phase no matter what. Once you see his cast bar for quake stop DPS and spam heal LHW with all 4 shammies to your tank to keep him up. Once you get him full just spam a chain heal and you should be good, and continue with the all out DPS. I don't ever get hit by more then one quake now while he is in Rhino form anymore.