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post #1 of (permalink) Old 07-04-2001, 09:14 AM
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u joint angles

What are the proper angles for a driveshaft? The rear driveshaft on my CJ7 has a big appetite for ujoints. I suspect the angles are the problem but am not sure what they should be. The t case end looks like it is close to 15-20 degrees and the pinion is almost lined up straight. I have Rancho 2 1/2 springs under axle and used the shims in the Rancho kit.

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post #2 of (permalink) Old 07-04-2001, 09:53 AM
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Re: u joint angles

Do you have a CV shaft? If not, that it the reason why, the U-joints need to cancel one another to work properly.

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post #3 of (permalink) Old 07-04-2001, 09:56 AM
 
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Re: u joint angles

It doesn't matter what the angles are, only that they are the same; this is with a conventional driveshaft. The angle at the pinion yoke needs to be the same as the angle at the Tcase yoke. The other driveline you can use is a double cardan setup (commonly referred to as a CV shaft). With this style shaft, you put all the angle at the transfer case end. The pinion will point directly at the transfer case yoke (actually you would like it to be a degree or two down from that, so when your driveline is under power and the differential wraps slightly, it will then be pointed straight at the Tcase) and the double cardan takes care of all the angle.

http://www.outdoorwire.com/4x4/tech/pinionangle/

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post #4 of (permalink) Old 07-04-2001, 10:15 AM
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Re: u joint angles

In other words, the pinion shaft and transfer case shaft need to be more or less parallel to each other if you've got a standard drive shaft. Are you sure you put the wedges on the right way? Also, don't forget that extended shackles will also tilt the axle i.e. change the pinion shaft angle.

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post #5 of (permalink) Old 07-04-2001, 10:53 AM
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Re: u joint angles

I understand that the u-joints are at the same angles to cancel each other out, but on a CV shaft there are three u-joints, where is the third on getting it's balance from, or does the whole CV section act as one joint and the other end of the shaft balance with teh whole assembly?

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post #6 of (permalink) Old 07-04-2001, 11:30 AM
 
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Re: u joint angles

The third joint is straight in line with the driveshaft and the pinion and thus has no angle that needs to be canceled out. It serves as merely a coupling between the shaft and the pinion. In a perfect world you wouldn't even need a ujoint there, but in reality the pinion does flex a little as power is added and subtracted, and the springs wrap and unload; the purpose of that third ujoint is to allow for that little bit of movement.

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post #7 of (permalink) Old 07-04-2001, 11:33 AM
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Re: u joint angles

No. The CV section's two joints are always in the same angle therefore self canceling the rotational differences. The third - pinion - joint needs to be set within 1 or 2 degrees of the tcase output shaft therefore eliminating the rotational difference due to angular difference. With two joints it doesn't matter if the angles are canceling - stock setup - or additive - CV joints - as long as they're the same the ends of the drive line will rotate at the same speed and this is what you want. The third joint in a CV setup basically needs to act as if it doesn't exist. If this is not possible in extremely steep angles then you need to use a double cardan joint setup.


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