Anybody Use This Product To Seal A Head Gasket Leak?
Called Steelseal

I would Highly DISCourage the use of such any product to repair a head gasket issue. Spend the money and get the headgasket problem repaired! The 4.0's and 2.5's are both cast heads so they can take allot of abuse. I would suggest pull the head, deck it, replace the head gasket and would also look into replacing the water pump, or what ever offending item caused the headgasket to go. But thats just my opinion.