Another idea if it's not the above is a small freeze plug leak. I had been slowly loosing coolant for a while on my Jeep at one time. When I pulled the tranny, clutch and flywheel to do a clutch, I noticed the rear freeze plug was leaking. The coolant then evaporated off the block before it could drip. Unfortunatly, without pulling the flywheel off, this just looked like a rear main seal starting to leak. But there are other freeze plugs you could check.
1997 Wrangler SE: 2.5L, NV3550, NV241OR, HP30 front, Rock Jock 60 rear, 4.88s/Detroit Lockers, 35" TrXus MT, TOM WOOD 'shafts, Warn XD9000i, pollock with a skinny pedal behind the wheel
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