Bought a 2000 silverado. 3/4 ton 6.0 truck 2wd. It used to be a county truck. I suspect the 4l80e is newer. Has iron heads. Cats are cut out. Drove it 30 miles from where I got it, runs surprisingly well. Need to give it a good look over before I really drive it any further. Just going to document my some basic baselining. Follow along if interested...