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Unread 02-26-2013, 05:35 PM   #1
skizriz
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Pinion angle with anti wrap bar

When I tear out my axle, I plan on welding up the center section, and welding on new spring perches.
When I originally did the SOA, I dropped the rear pinion angle down 2* from the output shaft angle to compensate for some upward pitch under acceleration. It has always been fine so far.
Now that I am also adding an anti-wrap bar (trashed my old springs), should I put my pinion angle dead nuts on with my output shaft?
Seems like I should since it should no longer rise, but I can't find any info about it.

Trying to get all of my ducks in a row before I tear everything down.

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Unread 02-26-2013, 05:57 PM   #2
bajaviking
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If you had no vibration issues before why not just leave it like that, at least you know it works.
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Unread 02-26-2013, 06:15 PM   #3
skizriz
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My thinking is that like it is, the pinion rotates up during acceleration, the angles are fine.
With the anti wrap bar installed, the pinion will no longer rotate upwards, the angles will always be 2* off.
Am I worrying about nothing???
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Unread 02-26-2013, 06:45 PM   #4
nshefbuch
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You're worrying about nothing. Even with a anti wrap bar it still might flex some especially if using bushings not heims. Also, upon the axle trying to rotate the shackle on the other end may move slightly and your pinion angle may change a degree.

I welded my anti wrap bar on after setting pinion and have had no issues and I too set it 2 degree down.
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Unread 02-26-2013, 07:38 PM   #5
jurgen24
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Quote:
Originally Posted by skizriz View Post
My thinking is that like it is, the pinion rotates up during acceleration, the angles are fine.
With the anti wrap bar installed, the pinion will no longer rotate upwards, the angles will always be 2* off.
Am I worrying about nothing???
But if during coasting it does not vibrate, then 2deg down is OK, even if trackbar locks in the axle. I think in general you need some slight degree difference otherwise the needle bearings in ujoint will not rotate.
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Unread 02-26-2013, 11:21 PM   #6
82JeepCJ7
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Mine is still 2 down and with the torque arm it does not vibrate. I am guessing there is enough give in the bushings that it allows it to rotate up the 2. I'm not worried about it.
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Unread 02-26-2013, 11:41 PM   #7
skizriz
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Thanks guys. I will be using bushings at each point.

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