First, if you do a search you will find plenty of info on this.
Job 1 is the early production of the Trac.
In 2001 they had a Job 1 and Job 2. Job 1 had some quirks and issues that were addressed and corrected at the factory. The second generation with the corrections is the Job 2 vehicle.
There are actually several differences in the 2 vehicle.
Follow this link, you will have all your questions answered...