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Driveshaftology:The Ins and Outs of Driveshafts and U-Joints

Custom Jeep Grand Cherokee
Verne Simons
| Senior Editor, Jp
Posted June 28, 2012

We’re Not Rocket Doctors

U-joints are simply awesome! Why? They allow rotational forces to be transmitted around corners. U-joints, Rezeppa-joints, Double Cardan-joints, and CV-joints all allow your driveshafts and axleshafts to spin and your tires to turn. Sounds technical, huh? Not really. It’s actually pretty simple, but if a U-joint or driveshaft is unhappy so is your Jeep. And without addressing the problem you soon will be too! We recently lifted our blue and grey ’01 WJ Laredo with a 6-inch Clayton Off Road long-arm suspension and as a result had to play the game of adjusting pinion angles, driveshaft style, and length in an attempt to make a much taller and more capable off-road vehicle drive down the road without sounding like a DC-3 fighting for altitude.

Follow along as we talk about the ins and outs of pinion angle, driveshaft length, and collapsible driveshafts verses slip-yoke-type transfer cases all with the help, parts, and advice of Tom Wood’s Custom Drive Shafts. We also will show a little more about one of Tom’s products; a NP242 slip yoke eliminator for the early XJ T-case in our ’01 WJ.

This kit is a breeze to install and allows the use of a longer, collapsible, and shiny Tom Wood’s rear driveshaft without having to cut, machine, and tap your NP242’s mainshaft in the driveway. And if you’re confused about driveshaft types, measuring for angles, slopes, U-joints, or any of that high-tech stuff, the company’s website is filled with info.


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Tom Wood's Custom Driveshafts
Ogden, UT 84404