Problems with 2001 GMC Yukon XL 2500 TIRES

Firestone tire tread seperation steeltex radial r4s, lt245/75r16, manufacture dated 36 month 2001, with 16000 miles of wear. handling difficulty at low and mid speeds. replaced tire and have the defective one.*ak

I have a 2001 gmc yukon and it came with firestone steeltex at tires lt 245/75r 16. the tire's dot # is vn11 bac 4700. i was going south on hwy 101 and the front end began to vibrate. before, i could pull over the tread completely separated from the tire core and was flying all over the highway. the core still held air and i was able to pull over with out any incidents. i drove the vehicle about 1 mile to the next exit where i was able to change the tire and examine the vehicle. the vehicle sustained minor body damage where the tread hit the inside of the wheel well (driver's side front). i have sent the core to firestone and they said that it was caused by sustained high pressure in the tire. i disagree with this because all 4 tires had even treads with out any bald areas in the middle and the tire press was checked right before my trip. when i replaced the 4 tires, the salesman look at the other 3 and he said that they wasn't anything wrong with them. they still have the core if you would like to examine it. *nm