the ones i just warrantied out were 4004
and for the record (i do work at a sears auto center, for the past 6 months) ive never seen a tire over 2 years old on our shelves, but a quick easy way to tell at sears is to look at the white lines across the tread of the tires, every 4 months we are supposed to go down the rows of tires in the warehouse and put a line across the tread, that way when selling tires, we choose the ones with the most lines, that is supposed to make sure that tires dont stick around for too long, so far worst ive seen is 5 lines