Was at shop returning truck to install ordered electrical parts on 3/13/18, when the installer called me over to show me an extremely large gash in tire tread, complete width of middle tread and about 7 inches in length. (have photo)leaving the membrane exposed. I was there on Friday 3/9/18 with initial repairs & this was not noted! ( tires were balance due to outage of wire for ABS) I drove back home 50 miles on Friday, did not move the truck all weekend, till my return on Tuesday (13th). When discovered. He advised me to get this repaired immediately! I drove cautiously approx. 4 miles to local Chevrolet dealership (reliable) it was around 4pm, I explained that I did not have appointment, and needed immediate attention due to damaged tire ready to blow out! I explain this looked like manufacture defect. Needless to say none was covered by insurance, I paid out of pocket $274.24. I am so thankful I did not have a blow out driving to albuquerque, nm this is highway most of the way, with speed limit 70 mph. And most grateful my 3 grandkids were not with me, , as I frequently pick them up from school. This could of definitely been devastating. The service dept. Assumed I ran over something. This is a newer truck I only have 9688 miles on it, and careful to watch what is on the roads. As this was the driver rear tire involved, the front was not affected at all" is this possible it is a manufactured defect " I have never had this happen to a tire on my vehicles before, as I am 65 yrs old. Do I have to wait for this to happen to another tire on this vehicle from this company with possible tragic results. I will do my diligence in inspecting tires before I leave, but this could of happen as I drive traveling once again on highways.

- San Ysidro, NM, USA