SF-131. 1310 series, Superflex U-joint from Tom Woods. These offset u-joints are designed to stop driveline binding and allow driveshafts to spin at higher angles. They should ONLY be used in low speed, offroad applications where driveline angles are too extreme to allow standard u-joints to work. With that being said, they work great for rock crawlers with extreme suspension travel. It doens't matter how strong your driveshaft is, if the u-joints bind, the driveline can fail in the parking lot!
WARNING: Offset u-joints will cause vibration at speeds over 10 mph!
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