My nephew is looking at a 1988 K3500. I could have sworn the first year for the IFS was 1992, but this shows to be an 1988. However, the car fax he ran shows the first event as 1993, but doesn't show the mileage. It has no history, on car fax anyway, between 1988 and 1992. Does this sound fishy or am I just loosing my mind.