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
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 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).
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.
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
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
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.
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.
|Klune-V Contact Info:
P.O. Box 779
Camino, CA 95709