I own two 2003 Sierras. One 2500HD and a 3500 dually. I absolutely love my trucks. The dually is a beast. Tows my 10,000 lb air compressor and hauls anything I put in the bed. The injectors needed replacing and I’ve replaced the Allison but after 20 years I can’t really complain. My 2500 is 2WD and drives all over the country. Both have 220,000 miles. I read all types of criticism about the LB7 but I haven’t experienced any real issues. I know the injectors eventually need replacing but is there something else I should watch out for? I really like these trucks co,pared to the newer models. Any advice/guidance is much appreciated