Leaks at the front and/or rear differential pinion seal and from the transfer case are common. Leakage from the transfer case normally occurs at the case-mating surfaces and require removal of the transfer case to reseal.Google+
Car Problem Reports
Jeep Wrangler Front and Rear Differential Pinion Seal and Transfer Case Leaks
Jeep Wrangler Problem
Drive Trains Affected: 4WD, Automatic Transmission, Manual Transmission
Average Mileage: 77,440 mi (25,600 mi - 150,000 mi)
Visitor, 2004 Jeep Wrangler, Manual Transmission, 35,500 mi
im a chrysler technician and own a wrangler myself, this is the bigget problem on the wrangelers up to 2006 the front and rear pinion seals leak. these cars are industructible though nothing can stop the 4.0liter inline 6
Visitor, 1995 Jeep Wrangler, Manual Transmission, 118,000 mi
rear end leaking at pinion. transfercase leaking all over.
Visitor, 1994 Jeep Wrangler, Manual Transmission, 122,000 mi
Currently have a small leak in my transfer case. I got an estimate and it looks like it will cost around $500 to fix.
Visitor, 2006 Jeep Wrangler, Manual Transmission, 68,000 mi
I was inspecting the under side of my jeep the other day and noticed it was leaking. I took it to the dealer and they said it wasn't covered by the warranty. So I'm in the process of having it fixed now!
Visitor, 2009 Jeep Wrangler, Automatic Transmission, 61,000 mi
Leak in front differential- not fixed yet
Visitor, 2006 Jeep Wrangler, Automatic Transmission, 75,600 mi
front and rear seals leak and so does camshaft seal
Visitor, 2006 Jeep Wrangler, Manual Transmission, 87,000 mi
Bad leak/compression loss around front passenger tire area
Visitor, 1999 Jeep Wrangler, Manual Transmission, 45,500 mi
diagnosed at a dealership, not fixed
Visitor, 2002 Jeep Wrangler, Automatic Transmission, 105,000 mi
leak in transfer case.
Visitor, 2005 Jeep Wrangler, Automatic Transmission, 49,670 mi
Both front and rear differentials were leaking and it cost $160 for each ($320) to repair at Scottsdale dealership.