I am going to buy a 93 tt supra but the problem is that its an automatic. My question is that can the transmission still be replaced with a six speed along with the engine?

Enjoy your new home.

moved

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it's my job to keep punk rock elite

You can swap the transmission with a 6-speed, and keep your current engine, or you can swap out the engine with a new one if you want. www.mkiv.com has some good info. Here's the link for the trans swap:
http://www.mkiv.com/techarticles/auto_to_6spd_swap/index.html

Former owner of a 94 TT Auto