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John Stewart

4x4 Tech: Driveline Basics


"It's just a steel tube with a u-joint at each end that transfers torque from the output of the transfer case to the axle. Nothin' special, right?" Well... yes, but that is an over-simplified answer.

There are many subtle things about a drive shaft and the conditions it operates in that will greatly affect how well the drive shaft performs. These subtle variables may have a profound impact upon the life of the drive shaft components, the amount of vibration the drive shaft produces, and whether or not the drive shaft is even capable of meeting your vehicle's specific requirements.

In this article we'll explain some of these subtle but extremely important variables, teach you about the different types of drive shafts that exist, and help you understand how to adjust the operating angles to ideal for the type of drive shaft that you have.

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John Stewart

4x4 Tech: A look at axle wrap prevention devices

Don't let this happen to your springs. Springs can deflect to take this shape under load, when the pinion has rotated up in reaction to the torque applied to the tires

Axle wrap is a problem that plagues leaf sprung vehicles with soft springs, particularly those that are set up SOA (Spring Over Axle). Axle wrap is something different than wheel hop. Wheel hop is when an axle on your 4x4 rapidly hops up and down. Axle wrap is unwanted suspension movement that allows the pinion angle to change. Wheel hop is annoying and could cause drivetrain breakage, but usually it's not the actual hopping that breaks parts, it's the axle wrap that results from the hop that causes drivelines to bind and breaks yokes, drive shafts, and sometimes even pinions.

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John Stewart

Jeep Tech: All About Frames


The Jeep Technical frame pages are all about frames for Jeep vehicles. Jeeps used regular channel frames, boxed frames, and tube frames. Later Jeeps use a frameless uni-body construction in the XJ, ZJ, and WJ. Your frame might not be up to the task of hard use, especially if it is old. Frame boxing and gusseting can prevent frame cracks. Skid plates and cross members are also covered in the frame section.

Read more about Jeep Tech: All About Frames in the 4x4Wire Archives.

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John Stewart

Brown Dog Offroad Introduces New "K" Series Motor Mounts, Teams Up with NAXJA

Cherokee Motor Mounts
Brown Dog Offroad introduces new "K" series motor mounts designed specifically for Jeep Cherokee XJ and Comanche MJ at NAX JA (North America XJ Association) 2009-2010 regional and national events.

Gilbert, Arizona (PRWEB) June 18, 2009 -- Jeep Cherokee XJs and Jeep Comanche MJs driven in off-road conditions are prone to worn or broken motor mounts. Brown Dog Offroad is introducing Cherokee and Comanche owners across North America to the new "K" series motor mounts and helping sponsor NAXJA regional and national events over the next year.

"Engineered to bolt directly to Cherokee and Comanche OEM six-cylinder engine brackets, neither the mounts nor brackets require any modification," reports Tim Shideler, Chief of Engineering, Brown Dog Offroad. Backed with a life-time warranty, the double-welded, all-steel motor mounts feature replaceable Classic Polyurethane or Ultra-Flex Rubber bushings.

"Everyone needs motor mounts and Brown Dog offers some of the best. In fact, I'll be putting them in my Jeep when I replace my stroker later this summer," said Cal Tuttle, Sponsorship Chairperson, NAXJA, "We don't take any profit from our sponsorship program. NAXJA gives between 8 and 20 thousand dollars yearly to support land-use battles and other related non profits such as search and rescue, volunteer fire departments, etc."

NAXJA Regional Events for remainder of 2009 include:
June 25-28, 2009 - NWFest, Naches, Washington
July 2-4, 2009 - Cherokee Crawl, Morris Mountain OHV Park, Alabama
July 19-25, 2009 - ColoradoFest, Buena Vista, Colorado
August 14-16, 2009 - Intermountain Chapter Geostash Challenge, Uinta Mountains, Utah
August 28-30, 2009 - SierraFest, Shaver Lake, California
October 6-10, 2009 - National Fall Fling, Moab, Utah
2010 events have not been announced.

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John Stewart

Rough Country’s New Adjustable JK Disconnects

JK Disconnects
Dyersburg, TN – Rough Country is pleased to announce new 07-09 Jeep JK Adjustable Disconnects. Featuring a 90 degree spherical ball joint for full range of motion, this kit fits on Jeep JK’s ranging from stock height up to those with 6” of lift. The new adjustable JK disconnects release quickly with an easy to use mounting pin and also include a frame mount bracket to keep the sway bar link away from all moving parts. Available for immediate purchase and priced at less than $60, this upgrade is one that JK owners will want to invest in.


For more information about the new adjustable JK disconnects, please contact Rough Country Suspension®. Products at http://www.roughcountry.com or call 800-222-7023 today! You may also contact Rough Country® to find an authorized dealer near you, or visit the “Dealer Locator” link at http://www.roughcountry.com.

About Rough Country:

Formed in early 1970’s, Rough Country Suspension®. Products was one of the founders of the off-road industry and today is one of the fastest growing manufacturers and marketers of lifted suspension packages and off-road accessories for both 2wd and 4wd trucks and SUVs. Rough Country Suspension®. Products is owned by Heckethorn Products®. Heckethorn Products® has a storied history in the automotive aftermarket that includes inventing the first steering stabilizer for military Jeeps in the 1950s.
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