Curious, what if any 2008 sedan G35S parts fit/interchangeable on 2003 Sedan G35? Your time and knowledge is appreciated.....

 

There was a major chassis revision between the V35 sedan (2003-2006) and the V36 sedan (2007+). Some components will swap if you take the entire system (brakes), some components will swap if you're willing to do extra work swapping out multiple systems (engine, transmission), some components only fit with major fabrication (front end body, headlights).

Best to look up individual components and see if they can be swapped, plenty of threads for each, just google search and add "g35driver.com" to the search body.

 

Thanks for the information, I’ll definitely check out the website you recommended

 

If I do the transmission swap, what besides the transmission would I also need to swap over onto my car?

 

There's quite a few threads for doing the HR swap on both the G35 and 350Z, just google search "hr swap g35 350z" and you should get an idea of the work involved.