Specifications

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Harmonic Balancer Kit:
We offer a harmonic balancer kit for the Jeep 4.0L engines. Our kits mount to the oil pan bolts on the passenger side of the block.
Jeeps 1991-1995 may require the drive belt to be rerouted and/or a new drive belt may need to be purchased. Our kits is designed
to use a stock two-bolt sensor. The kits includes a modified harmonic balancer, sensor support bracket, and a new sensor.
P/N 716012 - Fits 1997-2004 4.0L blocks (5 volt system)
P/N 716012-C - Fits 1991-1996 4.0L blocks (8 volt system)
NOTE: This kit will not work on a 258 6 cylinder that has been retrofitted with a 4.0L
intake fuel injection system.
jeep tranny upgrades (1987 & newer)
RUBICRAWLER GEAR BOX
This units fits Jeeps 2003 to 2010 with the 42RLE automatic overdrive transmission. This new reduction unit replaces the stock
42RLE tailhousing with a 6 gear planetary reduction box featuring a 2.72 low range. This is a true bolt-in doubler that couples to the
stock Jeep transfer case or an existing Atlas transfer case.
Features: The RubiCrawler increases our available gear ratios allowing you to gear your Jeep to the terrain in which you’re wheeling
on. The various ratios will allow you more control of the vehicle which results in extreme off road performance while maintaining
a fun and safe offroading experience.
Stock Transfer Case Functions: With the Rubicrawler installed in any Jeep, The Normal two wheel drive feature of your Jeep does
not change. The city or rural road handling of your Jeep is the same as it was the day you bought the Jeep.
Stock Transfer Case Functions with the RubiCrawler in High Gear: Rubicrawler in high range and the transfer case in four wheel
drive high range (all Jeeps). The gear ratio of the transmission does not change. This feature gives you power to all four wheels.
Rubicrawler in high range and the transfer case in four wheel drive low range (non Rubicon Jeeps). The final gear ratio with the
transmission in any gear is reduced 2.72 times lower. This feature gives you power to all four wheels.
2a. Rubicrawler in high range and the transfer case in four wheel drive low range (Rubicon Jeeps). The final gear ratio with the
transmission in any gear is reduced 4.0:1 times lower. This feature gives you power to all four wheels.
Stock Transfer Case Functions with the RubiCrawler in Low Gear: Rubicrawler in low range and the transfer case in two wheel
drive (all Jeeps). The final gear ratio with the transmission in any gear is reduced 2.72 times lower. This feature does not give you
power to all four wheels, but provides slower speeds and more throttle response for easy trail use. The nice feature of this is that
you have more torque and better handling.
Rubicrawler in low range and the transfer case in four wheel drive high range (all Jeeps). The final gear ratio with the
transmission in any gear is reduced 2.72 times lower. This feature give you power to all four wheels and provides a shift on the fly
option for four wheel drive. The New Process transfer case can be shifted into high ratio on the fly; so if you’re in sand, mud or
offroad trail and need power to all four wheels this is a great option.
Rubicrawler in low range and the transfer case in four wheel drive low range (non Rubicon Jeeps). The final gear ratio with the
transmission in any gear is reduced 7.40 times lower. This feature gives you power to all
four wheels. This is an extreme crawl ratio that provides a slow controlled approach to
an obstacle.
3a. Rubicrawler in low range and the transfer case in four wheel drive low range
(Rubicon Jeeps). The final gear ratio with the transmission in any gear is reduced 10.88
times lower. This feature gives you power to all four wheels. This is an extreme crawl
ratio that provides a slow controlled approach to an obstacle.
Ratio’s with a Stock New Process 231/241 are a 2.72:1 and a 7.40:1
Ratio’s with a Stock NP Rocktrac are a 2.72:1, 4.0:1 and a 10.88:1
The RubiCrawler’s shifting mechanism utilizes push/pull cable technology for a smooth
and easy shift. The universal cable shifter is included with the purchase of your
RubiCrawler. (The universal shifter should be used if your vehicle is equipped with an
Atlas transfer case)
We also offer a twin stick cable shifter for the Jeeps. These kits are designed to fit the stock TJ and JK consoles. These shifters
are an additional charge but are the best suited for most installations.
The Jeep TJ’s twin stick shifter replaces the standard hard linkage. We have designed a twin stick shifter that comes through the
stock console for a clean installation that operates the RubiCrawler and the stock NP231 or NP241 transfer case.
The twin stick JK shifter also provides a twin stick shifter through the stock console. This kit retains the stock transfer case cable
with the addition of the new RubiCrawler cable.