My OEM original radiator on my 2003 just cracked in that same spot. 204K and 21 years old not bad… Doing a new rad, hoses, and putting in a new front crank seal while I have all front coolers out.

Excellent info to look at for reference! Do you ever notice a slight loss of power with elevated rpms accelarating from standing after the 5.9 has been running for a while on a warmer day, as if it's towing something without a load? Every one in a while my 5.9 will do that moving from a traffic light or a stop.

Thanks for the updates! Really enjoy the Cummins content! 👍

Transmission band adjustment video.....