Just finished rebuilding the topend of my 4.0L got it running beautifully and parked it in the driveway. Next morning I came out and saw a huge puddle of antifreeze in the driveway. Looked and saw a continuous drizzle of coolant. Thought the block was cracked. Turns out its a freeze plug right behind the motor mount. Anyone else have problems with these on the OHV's? And anyone know a schematic to tell which size it is? Auto parts store lists 3 different ones all around the same size.