06' Job 2's are trucks built after 01/12/06 or right around there. They are called "commonization engines" and just have some changes to the cylinder heads to make the assy line switch to the 6.4L easier. They run good, it has just taken some time for the Custom SCT tuners to get the programming sorted out. My 06 stock runs much better than my 03 ever did stock but the 03 ran much better with a custom tune.:shrug:Power Stroke said:how do you distinguish job1 and job2 6.0s from each other and whats the downside of having a job2?