The Jeep Liberty 4x4 can become an ultimate 'crawler with the addition of a Klune-V Extreme Underdrive. A built JB Conversions NP231 transfer case completes this ultimate off-road package.
We've seen many Klune-equipped vehicles on the trail over the years and have always been impressed with their performance. There's typically plenty of slow going but not a lot of stopping because the Klune literally climbs its way over most anything. After a careful look at the viable transfer case swaps and related upgrade parts for an '02 Jeep Liberty 4x4, we came to the conclusion that if mated to the right transfer case, a Klune-V would be an awesome addition.
The Klune-V Extreme Underdrive multiples existing gear reduction to achieve an insanely low crawl ratio. Thanks to its built-in clocking ring that offers threaded holes for studs around its perimeter, the Klune-V will bolt up to most transfer cases and only adds minimal length to the rear driveline (just 7 inches if an adapter isn't required). The unit can be mounted in any position and used for a wide variety of applications. Adding to its versatility, the Klune-V unit features two shifter-mounting locations in case one is rendered unusable due to the clocking position. The other location can be used as an inspection cover if it is still accessible after installation. A cable shifter is included with the Klune-V and includes an ample length of cable for multiple shifter-mounting possibilities. A direct-shift kit is also available. Two models of the Klune-V Extreme Underdrive are available to choose from: the 2.7:1 planetary-geared Goliath unit and the 4:1 double-compound, planetary-geared David. We employed a David unit to get that ultra-low Klune-V experience.
The Klune-V and upgraded "JB231" are a good fit under this '02 Liberty. Stout driveshafts from J.E. Reel complete the conversion.
Though the unit would easily bolt to the factory-installed NV242 transfer case in the '02 Jeep Liberty 4x4, we elected to seek a more trail-proven transfer case that benefits from greater aftermarket support. An NP231J 'case from a Jeep TJ was chosen and subjected to a complete rebuild using every available JB Conversions' NP231 upgrade in the book ("NP231 Forever," Oct. '06). We still maintained the 2.72:1 Low ratio, however, since the Klune-V will provide more than ample reduction. Mated together, the Klune-V and NP231 will offer four gear ranges to choose from: a 4WD High range (Klune disengaged, T-case in High), a 4WD 2.72:1 Low range (Klune disengaged, T-case in Low), a 4:1 crawl range (Klune engaged, T-case in High), and an extreme-Low reduction range (Klune engaged, T-case in Low). All told, a whopping 243:1 overall reduction was achieved with the installation of these components.
With the stock NV242 transfer case still in place, its deficiencies are apparent. The long rear slip-yoke creates excessive driveline angles when the vehicle is flexed and the use of funky driveshaft couplers rather than the more traditional (and stronger) yoke and U-joint connection complicates things even further. | 
The Klune-V reduction housing features dual shifter-mounting ports to accommodate the multiple clocking positions afforded through the built-in clocking ring. Klune-V units can be equipped with a variety of input shafts to mate them to many different transfer cases. A 23-spline input was installed by the company to meet the needs of the NP231. | 
Klune-V offers a cable shifter mechanism with its reduction housings. A direct-shift kit is also available. The cable shifter includes a length of cable, a shifter handle, and a mounting bracket. |
Klune-V also offers a universal footing mount that bolts between the transfer case and the Klune to ensure that both are properly supported. | 
Before removing the stock NV242 transfer case, Chris Johnson of Rock-Tech Offroad used a tape measure to determine how far the 'case stuck out from behind the 45RFE transmission and found it to be more than 21 inches. | 
Chris also measured the length of the Klune-V and the "JB231" combined to discover that both units together came in at just under 21 inches - more than 1 inch shorter than the NV242 alone. |