Hi there fellas, I've searched for this before and didn't find any, but if it's a repost please don't flame all you got!
I tried this today actually, and it works!
First, get to 58 (required to be able to quest in outlands). Then, attach your TBC TRIAL! With this, you can go lvl to 60 in outlands and get the perfect "twink" gear if you wanna stay at 60 but still wanna pwn asses with the new outland gear.
This TBC TRIAL ends after 10 days of activation. So when you are done, wait for the 10 days to pass and there you are, lvl 60 on normal account (no expansion) and still you have all that badass gear from hellfire peninsula!
Guide:
Go to World of Warcraft Europe or World of Warcraft Community Site . Then Account management.
Log on to your account, scroll down to FREE SERVICES and select TBC FREE TRIAL 10 DAYS. Click attach.
Read (if you want to) what's on the pages, otherwise just confirm everything and there you go!
Sorry if this is a repost.
Best regards,
Muskeljulle (Worthless@Darksorrow PVP)