Nissan Xterra Replace/Remove

Engine Of My Vehicle Listed Above Got Bad And Needs Replacement. Can I Replace The 4.0l Engine With A Lesser Say 3.3 L? What Are The Pros...

Hi I Just Recently Purchased This Vehicle And I Am Swapping Out The Radiator With A Csf All Aluminum One. I Want To Replace All The Rubber...

I Recently Had My Timing Belt Break Which Bent A Bunch Of Valves And The Repair Cost Is $2225.00. I Found A New Engine Online For $2145,.00...

Will The Engine Out Of A 2001 4wd Xterra Fit In My 2003 2wd Xterra?