Highest instance with 3?

Just curious, I'm working my way through Zanger at the moment, I was just wondering how far 3 could get. I have a druid, lock, and mage. Builds will change as needed, and I'm thinking feral for tanking. How far has anyone gotten? I'm not expecting a lot, definitely not Heroics, but at 70, could they get as far as Shadow Lab or Mana Tombs? Or are the pulls too much? Can I even expect to get through Coilfang?

I'm mostly thinking about it for rep grinding purposes, for the most part. I don't want to do the Consortium grind again, and the Scryor grind will be bad enough, but I'd really like Lower City exalted if I can, and any others I can get done before I move up to 5. I'm not even sure if this team will be the one that goes on to the 5 man team.

So far with my 70+65+65 shamies i've done Ramps+BF+SP.

I've tried SP with the clones at 63 but 5 mob pulls with a fearer and a mind controller are a bit rough >.< At 65 it was cake(ish) just need to know what your kill order is.
I reckon at 70 it should not be a problem tho, at least not up to the level ~66ish instances (Old Hillsbrad etc)

I dont think i'll be able to do BM / SH / SL or the TK ones. And i dont think any heroics at all. (then again, i soloed SL up to the first boss on my shadow priest :p )

My wife has a T4/ZA geared warrior tho, and with her help i'm pretty sure it will be a breeze.
That or i'll go and whack them at level 72+ :-)

Thanks guys, that's all I wanted, a ballpark of what's possible. :) It's not a huge issue, I have plenty to do before I start hitting instances.

I pretty much know I need to level a dedicated tank, and level my 27 priest. I'm just enjoying Outlands for the moment, I'm kind of burned out on pre-BC content at the moment. :) My guild bank was getting a little low on funds leveling my lock to 58, I forgot how fast gold piles up 60+! Especially since all I spend money on is repairs, and I'm not dying a whole lot right now. I want to build up my professions and gear before I get into instances.

This fall, I'll be buying 2 more battlechests, most likely, and I'll make one of them a Pally and/or Warrior, and RAF level them. Looking at how fast people are leveling, it'd be stupid NOT to - there's no indication when the RAF program will end, but I don't want to take a chance it's at the release of Wrath. :) Then I'll look at serious instance running. That's my goal for the long haul, for now. My druid/lock/mage team was to get into MBing, not to be my only team.

There was a guy who posted videos a while back in the showoffs section. Heroic shattered halls... BT geared (dual blades of Az) rogue tanking and 2 shammies I think.

I solo'd the first boss in Heroic Slave Pens on my S3 geared hunter. Set up a macro for my pet to kill the right totems and him and I kited him in circles for a long long time. That was before I found multiboxing and found theres easier ways to get things done by yourself. :D