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Old March 22nd, 2008, 11:55 AM   #1
JellyBelly
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Default Yoke orientation

I've seen some lifted trucks that had the rear axle turned so the yoke was pointed several degrees upward toward the driveshaft.

Some people say that's bad, others say it's just fine. I can't see how the orientation of the axle would change anything in terms of axle longevity. If the gears are turning and you haven't run it out of lubricants it wouldn't seem to make any difference at all. I know one guy who is just dead set against having the diff anything but level.

Will turning the yoke skyward reduce the axle's longevity?
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Old March 22nd, 2008, 12:11 PM   #2
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Even stock more aren't level. Generally you want it at the same angle as the driveline, or if it's a CV type shaft pointed at the t-case yoke. One thing you need to be careful of is if you drastically change the angle the fill plug might not be at the proper height to give the correct fluid level.Also, some axles might have issues with oiling the pinion bearings if rotated to high
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Old March 22nd, 2008, 12:16 PM   #3
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Generally only in extreme cases is it going to hurt the diff itself. Thats when its so high that the pinion bearings don't get proper oiling. People in this case often overfill the diff through the vent fitting.

There are various rules that dictate your diff placement, but the base rules are that if its a CV joint, the diff should be pointed in line with the driveshaft. If its a regular U-jiont, then it should be pointed upwards at the same angle that the t-case rear output is pointed downward.

Then, depending on your suspension type (leaves vs links, bushings vs solid joints, etc), you need to point it down a degree or two from those points due to axle wrap.
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Old March 22nd, 2008, 01:35 PM   #4
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Quote:
Originally Posted by Haggar View Post
Generally only in extreme cases is it going to hurt the diff itself. Thats when its so high that the pinion bearings don't get proper oiling. People in this case often overfill the diff through the vent fitting.

There are various rules that dictate your diff placement, but the base rules are that if its a CV joint, the diff should be pointed in line with the driveshaft. If its a regular U-jiont, then it should be pointed upwards at the same angle that the t-case rear output is pointed downward.

Then, depending on your suspension type (leaves vs links, bushings vs solid joints, etc), you need to point it down a degree or two from those points due to axle wrap.

Right. The reason for non-cv type shafts to have the same angle is that when u-joints go through their rotation, they are go through a (for lack of better words) gyration where they actually move the shaft axially a slight amount. This can cause a vibration. By matching the angles on each end of the shaft, the motions offset each other. This is the same reason if you put a spline together with the yokes not in line on the driveshaft that it will vibrate like a bi$ch.
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Old March 22nd, 2008, 02:17 PM   #5
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Maybe once I get this straightened out (so to speak) I'll get around to putting the fancy diff cover I've had collecting dust for three or more years....
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