I have done this swap . You must change the torque convertor to match the motor . The 5.9 is externally balanced where as the 5.2 is internally balanced . The install is straight forward , no differences . I still used the 5.2 computer with no issues at all . I hear others say you need to replace the computer .
There may be a difference in programming , but it will run and run without a problem . If theres any more questions just post them and we'll help you out . Glad you joined us and welcome to the Z for Rams from Baltimore . If you could go to the top of the page to the User Cp and complete your profile that would be great . Helps us see what you have when your posting a question . Any pictures of your truck ? Any mods done or plans for future mods ? Any of your friends have Rams ? Tell them about us . We would love to have them . You will find this site is full of a lot of talented people . So if theres any question that you need answered , just shoot away . Talk to ya soon . Tom