Thought at first it was a headgasket, found out fri afternoon i got the crack behind the heatexchanger :{ . I have 129k now on the truck only minor mods, I did some searches but need to know who to call. Does anybody have a name and #. Would love to hear from fellow members who had to deal with a cracked block and their truck being past 100k. I heard that Cummins will pick up 1/2 the tab of a rebuilt. I need as much ammo as fast as possible, this truck is my bread and butter. I would rather fix if reasonable than start all over with payments. I can get the truck in mon afternoon at Cummins.