I don't have any pics of this but I'll summarize. 218k.
- Drain coolant at radiator drain
- Disconnect overflow tank house, route down, and let the tank gravity drain
- Disconnect heater hoses at pass side valve cover and blow out with air
The 4th step was supposed to be left and right block drains to get the final gallon. They did not look super healthy. There is brass in there and I know that stuff can seize. So I left it alone. Replaced about 2 out of 3 total gallons. I'll try to do it again in a year or something.
I was able to do this with the truck on the ground. I could even get to the block drains with the wheels on and the truck on the ground (if I wanted to attempt that).