Good video describing u-joint angles and phasing. My apologies if it's been posted before. https://www.facebook.com/video.php?v=804295642973475
The card in the gear sure makes the un-constant velocity easy to hear and understand. For most of the tests the front and rear yokes are not " in phase." Per DANA " A properly phased driveshaft has the in-board yokes of the shaft in line with each other." http://www.dana.com/wps/wcm/connect...=url&CACHEID=3b24a9004b1f548ca858fff859534476 The yokes should be aligned as shown in the upper driveshaft here - http://www.billavista.com/Tech/Articles/Driveshaft_Bible/images/phase.jpg
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