Join Date: Sep 1999
Location: Southeast Iowa
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Re: Help understand CV driveshafts and pinion angle!
[img]/wwwthreads_images/icons/smile.gif[/img] Well, JAMMY........this topic has really been gone over a lot at different times, and basically here is the scoop: A driveshaft is a "System". It takes two u-joints to complete the system and for the joint angles to cancel each other out. For reasons which I will not go into detail on, if you have only ONE joint and it is on an angle, the power delivery is fast-slow-fast-slow-fast-slow. The shaft actually SLOWS DOWN and SPEEDS UP as the jopint goes through the 360 degrees of roatation. MAn has discovered that by putting a joint at each end, and phasing them correctly, that the joints would cancel each other and the vehicle would not KNOW that the shaft speed was not actually constant.....the yolks were, but the shaft WAS NOT. A CV joint IS constant velocity BECAUSE it is actually a short driveshaft, since it has two of everything, two yolks and two spiders. It is SELF-CANCELLING. So....taking what you know from the above, when you have a CV joint on one end, you can run the opposite end at ZERO ANGLE.....that is you point the yolk right at the t-case where the CV is.....because there is no need to help the CV cancel. The CV has angle, the rear joint does not. And because there is no angle, there is no fast-slow-fast-slow effect from the rear joint. Using a CV helps you get the pinion nose up off the deck and gives you one less angle to deal with and wear out joints.[img]/wwwthreads_images/icons/crazy.gif[/img]
Quadra-Tracs modified While-U-Wait by the crack moonguy[img]/wwwthreads_images/icons/wink.gif[/img] Quadra-Trac Team.[img]/wwwthreads_images/icons/tongue.gif[/img][img]/wwwthreads_images/icons/smile.gif[/img]