Rear d-shaft max angles/cv joint wear - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-24-2000, 12:24 AM
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Rear d-shaft max angles/cv joint wear

what is the suggested max angle for the rear d-shaft to differential, and the max angle for the cv joint ??
If you are beyond the max angle, what can be done? Is there a better driveshaft (custom) for lifted trucks?
BTW its '93 full size bronco, 4-5 inches lift, 5.0L efi, 33 inch tires(31 inchers on the street).

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post #2 of (permalink) Old 04-24-2000, 12:31 AM
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Re: Rear d-shaft max angles/cv joint wear

Also, I just replace the u-joints all around including the centering ball, and I still have vibrations I'm sure are from the cv joint.
Old ford mechanic told me that once the max angle for the d-shaft has been exceeded the vibrations will start. Hope someone has
ideas. The vibrations are annoying and can't possibly be good for the driveline in the long run. U - joints are cheap, tfer cases and
diffs are not.

post #3 of (permalink) Old 04-24-2000, 01:32 PM
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Re: Rear d-shaft max angles/cv joint wear

You may need to install drop down brackets for the t-case to correct the angles. Were the diff's rotated to correct pinion angles when the lift was instaled?

[img]/wwwthreads_images/icons/wink.gif[/img]If it's stuck, force it! If it break's,it needed replacing anyway!!!
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post #4 of (permalink) Old 04-24-2000, 05:37 PM
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Re: Rear d-shaft max angles/cv joint wear

As far as I can remember, it is suggested to keep the u-joint to 7 deg. or less. They can tolerate up to 10 deg, but have increased wear and may vibrate. The vibration problem often occurs when the front and rear joints are running at different angles. With the two joints in the cv canceling each other out, the rear joint should be as close to straight as possible. On my 88 (stock height), the rear u-joint is just about straight at normal running position. When you lift truck, the rear u-joint becomes angled and causes many of the vibrations. If you haven't allready, try lowering the t-case and get angled shims for the rear axle.

post #5 of (permalink) Old 04-25-2000, 12:30 AM
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Re: Rear d-shaft max angles/cv joint wear

Where can you get the angled shims? What hardware is needed for dropping the
tfer case, just straight shims and longer bolts?

post #6 of (permalink) Old 04-25-2000, 10:17 PM
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Re: Rear d-shaft max angles/cv joint wear

Any four-wheel drive or speed shop should be able to get you some. Just ask for degree shims to change your axles pinion angle. I'm not sure what you need to do to lower the t-case, maybe just some spacers. Most likely longer bolts.

post #7 of (permalink) Old 04-25-2000, 10:44 PM
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Re: Rear d-shaft max angles/cv joint wear

Thanks for the info. I'll try the angle shims. I'll try to straighten up the pinion to
d-shaft angle first and then see how the vibes go.


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