I just bought my first rcsb Silverado. It's a 5.3L automatic. I got it cheap and it had 240,000 miles. It was used as a work truck so it looks rough inside and out but I couldn't pass up the deal since I've been wanting to build a race truck for a while now. I drove it home and into the driveway only to realize that there was coolant leaking, and once I was under the truck I also noticed the oil pan was leaking pretty steady. Also the transmission had some trouble shifting gears. But no worries here, I bought it to build into a race truck. I'm thinking I can do a 6.0L and a 4L80E and have a pretty nasty truck after a few other modifications.