Off-Road drivetrain articles and tech showing you how to repair and upgrade your transmission, transfer case, drivelines, axles, gears and other key drivetrain components on your Jeep Cherokee, Wrangler, CJ, TJ, YJ, JK & ZJ. Reviews on ARB, Yukon, Eaton, Poly Performance, Terra-flex.
 | November 4, 2009
By:Jim Brightly
The Jeep Creep on Flame-Thrower additions, wobbly u-joints, XJ lifts, Wrangler knocking and more.
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 | October 31, 2008
By:Jim Lougeay
Greasing the wheel bearings on a semi-floating rear Dana 44 can be an almost impossible task. Even after taking apart half the axle, it is still hard to get the bearings the proper amount of grease. This modification makes greasing the bearings a breeze. Check it out.
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 | September 23, 2008
By:Harry Wagner
The original Monster Box was big, beefy and the first-three speed transfer case available. Now STak 4x4 introduces the Mini Monster. With smaller dimensions it easily fits in the frame rail of almost any Jeep, 4x4 or truck adding much needed gear reduction and strength. We take a peek inside the monster to see what makes it so stout.
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 | October 15, 2007
By:Pete Bach
By now, most Jeep JK owners have taken a peek under their rigs, only to find drive shafts that are totally unusable.
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 | July 15, 2006
By:Jim Lougeay
The internal-spline Dana 44 front hub uses two tapered roller bearings, and a seal at the inboard end of the hub. At the outboard end of the hub is a drive-in cap that can allow water to enter, bringing grit along with it. Adding to the problem is the large volume of air in the hub.
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 | May 1, 2006
By:Matthew E. Stocke
By a huge margin, the number one question I get asked when people see my Jeep for the first time is: ?what is that tank in the back?? The tank is, of course a compressed liquid CO2 tank. But it can be used for so much more than just filling your tires. Read on??
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November 1, 2005
By:ORC STAFF
I have a stock 88 Jeep Cherokee Chief that has provided me with many miles of off-road driving pleasure both in the desserts of California and in the Mountains of Colorado. This winter, I decided to upgrade my Jeep and make it a better rock crawler. After doing some engine and suspension work, I turned to the stock open differentials. I spent about a month learning how every aftermarket differential works and corresponding with scores of people on the internet about their real world experiences with various types of aftermarket differentials.
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 | November 1, 2005
By:Terry L. Howe
The T-18 is such a popular swap for Jeeps because, in many cases, it can be installed for less money than any other heavy duty granny low transmission. The reason for this is the input bearing retainer size and input shaft length are right for '76-'86 CJs for the Ford and Jeep version.
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 | November 1, 2005
By:ORC STAFF
The NP207 has a aluminum case and an appearance similar to the NP231. It should have a tag on the back saying New Process Gear, Model 207. This chain driven transfer case uses a 21 spline input with the manual transmissions and a 23 spline input with the automatic transmissions. The output for the front driveshaft is on the drivers side. Low range is 2.61 and high is 1.00. This transfer case is widely scorned. If yours should break, look for a 21 spline NP231 or swap transmission and transfer case at the same time. The transfer case is upsidedown in the picture showing the input (it is drivers drop.)
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