Klune V Extreme Underdrive

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.

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

Available in the "David" and "Goliath" models.

The "David"

The David crawler is intended primarily for short wheelbase applications where extreme low-crawl gears are desired for moving very slowly and precisely through difficult or very tight rock formations, and up or down waterfall-type obstacles. The emphasis is on precision, skill and finesse. While plenty stout, it is geared too low to be practical for hammer-down, tire-spin applications. (If you need more tire speed, simply shift the David into 1:1 ratio, leaving your transfer case in low range).

The "Goliath"

On the other hand, the Goliath is intended for full-size, high-power hill climbing, mud boggin' pulling and tire spinning. Strength and unstoppability are the emphasis.

The Klune-V Extreme Underdrive's multiple low range provides the most versatile gearing set-up available.   If your vehicle is fitted with the "Goliath" Extreme Underdrive, you receive three different Transfer Case ranges:

• Normal High Range
• Normal Low Range
• An additional "crawl" range ­ 2.7 TIMES AS LOW AS YOUR EXISTING LOW RANGE

If your vehicle is fitted with the "David" Extreme Underdrive, you receive four different Transfer Case ranges:

• Normal High Range
• Low Range
• A 4.0 Crawl Range
• Plus an EXTREME crawl range FOUR TIMES AS LOW AS YOUR EXISTING LOW RANGE! (for those super technical spots you want to really creep through)

The Extreme Underdrive provides the most flexible set of options available to respond to the wide range of environmental challenges you'll meet.

It also means you can actually use your off-roader on the road to get to the off-road site.

For example: Say you have a stock Jeep with stock tires. It turns about 2700 RPM at 65 MPH. With 33s and 4.11 axles (or 35s and 4.56 axles), still close to stock and fairly civilized. You will maintain decent highway operation. But if you switch to 4.88 or deeper gears, the highway ride heads toward the unpleasant zone. Worse yet, these super deep-cut gears rely on a relatively small and thereby much weaker pinion gear.

Klune-V Extreme Underdrive Works in Any Position
While many Chevy, Dodge, Ford and Jeep vehicles use the same basic transfer case bolt pattern, Jeep/Dodge, Ford and Chevy have them rotated, or "clocked" differently from each other. The Klune-V Extreme Underdrive is cylindrical in shape, and doesn't care in what direction it is rotated.