GMC Sierra Cylinder Head Gasket Blown

Coolant Constantly Dropping But No External Coolant Leaks. New Oil Change Of 5w-30 At 105,470 Miles. I Am Only Around About 106,800 Miles...

Changed Oil And Filter, Checked For Leaks Not A Drop. I Checked Oil Approximately 30 Miles Afterwards Bone Dry. Again No Leaks At All. Walk...

I Have A '97 Gmc Seirra, 5.7 Ltr. It Has Trouble Shifting Into 3rd Gear And Will Not Shift Into 4th At All. When I Say "has Trouble" I Mean...