You probably have the 4.0l engine.
Lower intake manifold has coolant passages for circulating coolant from one head to the other, my ranger had a coolant leak, on the front, from that head to intake gasket.
Hard to see back there but I would check where the head and intake meet, both sides.
Also small pin holes in hoses can spray coolant onto areas that normally wouldn't be a place where coolant could leak from, so if the leak point doesn't make sense, check the hoses carefully.
Problem with small leaks are that they don't leak until engine warms up and gets 15psi of pressure in the cooling system.
A cooling system pressure tester(you can rent these cheap) can help find a leak, you can pump up the cooling system pressure to 20psi, on a COLD engine, then look and feel around for the leak.
Last edited by RonD; 08-04-2014 at 09:06 AM.