Drive shaft angle -
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post #1 of 8 Old 03-06-2012, 04:40 PM Thread Starter
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Drive shaft angle

So I keep busting universal joint clips which in turn means my axle falls loose on my lifted cj7 front drive shaft. Anyone know what the 'most' acceptable angle is for my front drive shaft? I have a Dana 300 using 13-10 u-joints. I'm looking into putting a 'u joint knuckle' in to see if it fixes the problem but would like to know if dropping my Dana 300 is necessary?!

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post #2 of 8 Old 03-06-2012, 04:59 PM
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Go through the CJ section here:

Also, some photos would help a lot to see just how steep your drive line is and your pinion angle etc...


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post #3 of 8 Old 03-06-2012, 05:02 PM
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How much lift? Does it have a transfer case drop? Pinion angles vary from front to back. I want to say a decent pinion angle is about 15 degrees give or take a few from that. Front axles are different you cant push up your pinion real high because it will affect your caster (death wobble and darting)
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post #4 of 8 Old 03-06-2012, 05:25 PM
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15 degree is max on a conventional u joint and binding will occur. This being said, at rest you will want about 7 degrees allowing for more angle when suspension flexes. The knuckle you mentioned is a cv joint which many cj7's have from the factory.

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post #5 of 8 Old 03-06-2012, 05:28 PM
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post #6 of 8 Old 03-06-2012, 05:52 PM
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As it is your front prop that is giving trouble it would not be an improvement to drop the Dana 300 as such. You can turn it and "clock" it but this will cause other issues and reduce clearances.

It is not clear which CJ you have as you have not filled in your profile but I assume it is an early 80s CJ7. The front shaft is, depending on gearbox, around 3-4" LONGER than the rear shaft. It is more common to have problems with the rear shaft when you lift the suspension as the angles will be acuter in the back.

If it was a CJ5 this would be an even truer observation.

So, why are you having problems with the front and not the back? Most users have their CJs in 4WD for only short periods and the shaft should be at rest. Are you only using it off road or are you using it in 4WD on tarmac?

When you say the clip fails do you mean the securing bolts that hold the bearing caps on to the shaft?

If it is your joints breaking or wearing out what grease are you using and howw pumped are they with grease? What brand of joints are you using? Spicer are reckoned to be superior.

I am just surprised you do not have these problems at the rear.

If you want to find out more about angles look up Tom Woods website.

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post #7 of 8 Old 03-07-2012, 07:12 AM
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Angles don't really come into play in the front shaft as it's not usually spinning fast enough to cause a vibration.

If the angle was really the problem you would be breaking ujoints instead of clips. Sounds like there are other things at play like possibly a damaged or worn out yoke.

At which end of the shaft are the clips breaking, axle or tcase?
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post #8 of 8 Old 03-07-2012, 10:15 AM
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Another thing that may come into play is if you have a lift that is extending the shaft too far. Going over bumps would tend to extend the shaft beyond it's intended length.
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