Deeres design life is in the neighborhood of 8-9000 hrs and since it has new motor and new transmission in the last 2000hrs you should be good to go for another 5-6000hrs.  On the Flip side the MT700 Challengers had a design life of 17-18,000 hours so there again you would be looking at 8-10,000 hrs before needing major engine/transmission work.