LBZ came with plastic impeller in water pump (Keep it cool if you can)
"Another issue came with the plastic impeller water pumps. They were prone to failure on higher mileage engines and sometimes caused overheating while cruising. Despite this, most of the water pumps still lasted between 150,000 and 200,000 miles."
Quoted from link below.
https://prosourcediesel.com/blog/che...e-lbz-duramax/
The major problem will be transmission overheating especially when hauling heavy loads in extreme conditions. I have a 2007 Silverado 2500 gasser with LY6. Transmission fluid was getting extremely hot, I added a 40K BTU cooler from TruCool. I also added a cast aluminum transmission pan that increased capacity by 3 quarts.
Link to cooler mod below:
https://www.gmfullsize.com/threads/m...pgrade.162659/
Cooler is about 8 times the size of factory. I still change the fluid after 30-40 thousand miles. Way cheaper than a new transmission.