My friend is selling his 2000 Jeep Wrangler Sahara 3960cc car at a good price. I was wondering if is possible to swap the petrol engine with a 2007 Jeep Patriot 2.0 CRD engine. Thank you!
Possible? Yes but it depends on many things:
if you expect to just remove and refit then no
But if you plan to change the complete drivetrain, manufacture engine mounts, gearbox mounts, new driveshafts and convert or adapt all the sensors required and deal with the ecu issues etc then yes.
You will likely need a full workshop and all the skills.
I have done this type of thing twice (v8 replacing 4cylinder and turbo diesel replacing 4cyl petrol), and it is not easy, but fun if you have the skills and knowledge.