whats the best gear box to fit to a 300tdi engine?

do you mind if i ask why you have gone for a 200tdi instead of a 300tdi? thanks for all the replies every body.

sorry for not formally introducing my self. i have browsed the forums but i was just looking for a list on what is needed exactly for the conversion. does any bulk head from even the newer defenders fit?

Ok firstly as i am new to this so hello. Oh also go easy on me as my knowledge is not on par with technical terms. I guess ill start by getting you up to date on with what i am doing. Start i have recently bought my self a 1988 defender 90 2.5td engine. i am just after Christmas taking...