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Jeep Project CJ-7

An ongoing Budgeted Rebuild/Build up of a Rock Crawling Machine.

Jeep Central
From Jeep History to Tech Specs and Projects.  This section is all about Jeeps.
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Installing 23,000 Volt Offroad Lights

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Jeep Dana 300 TeraLow - 4:1 Gearset for the Dana 300 Transfer Case




Klune V Extreme Underdrive



Klune-V 4-to-1 Under-Drives Now Available With Ford 31-spline Input

Klune-V has announced that it's 4-to-1 "David" under-drive gear box can now be had with built-in Ford 31-spline input capability. That means it can now be bolted up directly to a variety of Ford transmissions without the use of an adapter. This is a good thing because the shorter the transmission/transfer case combo, the longer the driveshaft you can have.

This sturdy bolt-in gearbox was originally developed to provide extreme “shiftable” multiple low ranges for (of course) Jeep Wrangler applications. While its 2.7 ratio brother, the “Goliath” would bolt in to Chevys and Fords without adapters, the 4 to one “David” model needed adapters to bolt to Ford transmissions. We have now added FORD 31 spline input capabilities to the “David” Model. For example, imagine a Ford Bronco, with say a 302. Say you bolt in an AOD trans for overdrive. The Klune David now will bolt directly to a 4WD AOD (or NP435, C6, ZF, T18, E4OD…). It will then bolt to a Bronco Dana 20 with a 1” adapter. It will bolt to a Ford 208, 205, BW1356, and such, either directly or with a ¾” spacer. Simple. You’re driving on the highway in overdrive. You get to the trailhead, air down. Shift into stock low range for the easy first mile of the trail. Now it starts to get rougher. shift the Tcase into Hi, and the Klune into Lo. Now you are in a 4:1, a good ratio for general “rough” stuff. Then there is a creek crossing with a bunch of large boulders you need to pick through. Shift both boxes into low and idle through, feet off the pedals, crawling with the tires turning about 2 RPM. On the other side is a sand hill you gotta climb. The guys with real deep gears are having a hard time because they can’t get enough tire speed to climb it in Lo range, and lug down in hi range. You shift back into your stock Lo range floor it, and you scoot to the top. You’ve got it all, and you’ve got it now. Check it out today: www.klunev.com

Klune-V "Extreme Underdrive" Basic Information

Klune-V is an Extreme Underdrive is an underdrive gearbox that bolts in place between the transmission and transfer case. Called "extreme," because the underdrive multiplies your existing gear reduction by up to 4 times, rather than a usual underdrive of 1.2 times, or so. It is intended for extreme four-wheel-drive applications, rather than towing or gear splitting in a big truck. It works equally well with both manual and automatic transmissions.

Full Warranty
Both units are physically the same size, and have the same bolt pattern. These units are new-manufactured, purpose-built units, which come with a full one year warranty. While similar to "dual transfer case" units in function, they are not built up from cut or sectioned used transfer cases.

4 Transfer Case Ranges:

  • 11.6 to 1 Extreme Crawl Range
  • 4.7 to 1 Crawl Range
  • Keeping Your Stock Low Range
  • Keeping Good Highway Gears
Klune-V Contact Info:
P.O. Box 779
Camino, CA 95709
Toll Free: 888-898-4331
Web: www.klunev.com
email: info@high-impact.net
High Impact - Klune-V Extreme Underdrive
High Impact's Greg Miller originally started Klune-V.  They offer system packages implementing the Klune-V Extreme underdrive

Klune-V Extreme Underdrive 4:1 "David" Cherokee XJ
Klune-V 4:1 crawler bolted to the NP231 DHD transfer case.  Installation and Review by 4x4wire.

Klune-V Wrangler install Article and Review
What got us most excited about installing the Klune-V Extreme Underdrive was, in a word, OPTIONS.

Atlas II Transfer Case and Klune-V
Combining an Atlas II and a Klune-V for Ultra-Low Gearing by 4 Wheel Drive & Sport ... 1994 Jeep Grand Cherokee Limited

Klune V from Advanced Offroad Solutions
The ultimate answer to all around gearing. Extreme reductions for hard core rock-crawling, standard lo-range for general off-roading, and street gearing all in the same vehicle.

Klune-V with Left-Drop Dana20 Transfer Case

Klune-V Manufacturer's Website
Klune-V Extreme Underdrive is an underdrive gearbox that bolts in place between the transmission and transfer case.

Klune-V into Jeep YJ
Installing a Klune-V into a short wheelbase Jeep


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