You can use your current transmission (code w58). The only problem is that you probably won't leave the 2jzgte stock for long. Once you go over 350hp, you're really going to be pushing to limits with the w58. You can pick up a r154 trans out of a mark 3 supra turbo or soarer 1jzgte pretty cheap and that'll hold a worked 2jzgte up to about 550hp. You'll need to get the soarer shifter though to make it work as the supra shifter is not the right shape. I'm not sure if the driveshaft needs to be lengthened or shortened either. Or, if you've got the cash, buy a 6sp v161 or v162 supra trans. You'll have to bang out room for it in the driveshaft tunnell but it would be sooooooo pimp to have a 6sp in a sc.