I was having terrible trouble out of my 6.5. I would be cruising down the road and all of a sudden the truck would go from 55 to 30 in a second and would sometimes almost put me through the windshield! I called several GM mechanics and diesel garages and... ...read more From: Travis H.
If its cooling a 6.5 L you are worried about, buy Walt's fabulous Cooling System/Fan Upgrade Combo Kit as well as the Heater Hose/Tube Push-Lock Connector as after its all installed 180 degrees is as hot as the engine will get. I installed these on my... ...read more From: Warren