Could I install this transmission? Sorry, but I am not a trained, certified and experience mechanic. No one here is as a norm. Since mechanics do not charge for questions, why are you not asking at an auto repair shop? For proper grammar please address the question to non one. "Will the Tiptronic (proper name, must be capitalized) transmission of a (year) Nissan 350Z (the letter suffix must be capitalized as registered) fit into a (year) Nissan 240SX (suffix letters must be capitalized)?" Will the Tiptronic transmission of a 2010 Nissan 350Z fit into a 2004 Nissan SX?" Writing requires knowledge, brains, desire and talent. I suggest you polish the grammar and composition while you wait on the car to be finished.

KA-24 (240sx) motor has a different bolt pattern. The vq-35 de motor in the 350z and transmission may make for a better conversion. A pre 2004, 4 cylinder pick up truck motor transmission (ka-24 again) may be a more common part to find.

yes

You can do whatever you want to if you have enough money to pay for it