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Old January 15th, 2010, 11:41 AM   #1
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Default Jeep SYE vibes

I installed a 8.25 and SYE and a XJ front shaft (all new serviceable u-joints from federal mogul) and since I had 4* shims I installed those, and the pinion/ds angle isn't quite straight.

I know it should ideally be straight, is going to 6* shims okay? I've heard that too big of shims could be bad. I'm not sure if that's urban legend crap or for real though.

Could a 3.5" lift be enough to screw up the front driveshaft angles (old ujoints, but they still feel pretty tight, and the D30 has new u-joints)
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Old January 15th, 2010, 11:54 AM   #2
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http://www.jeepin.com/features/sye/jbsye.shtml
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Old January 15th, 2010, 12:14 PM   #3
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I found some WJ/ZJ front driveshafts in the JY with a boot over the slip yoke....
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Old January 15th, 2010, 01:09 PM   #4
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Originally Posted by ChevelleSSLS6 View Post
I installed a 8.25 and SYE and a XJ front shaft (all new serviceable u-joints from federal mogul) and since I had 4* shims I installed those, and the pinion/ds angle isn't quite straight.

I know it should ideally be straight, is going to 6* shims okay? I've heard that too big of shims could be bad. I'm not sure if that's urban legend crap or for real though.

Could a 3.5" lift be enough to screw up the front driveshaft angles (old ujoints, but they still feel pretty tight, and the D30 has new u-joints)
Ideally you want the pinion angle to be down about 1 degree from being straight with the driveshaft. Being too high only makes it worse, since the pinion angle comes up under acceleration.

At what speed do you get the vibes? Maybe you have a bad u-joint? Is the joint held firmly centered in the yoke? (I had one the other day that had side-to-side play in the yoke).
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Old January 15th, 2010, 01:54 PM   #5
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I get the vibes 35-40mph or so, and at high speeds. The high speed part may be due to tires being not balanced well enough (it's been a while) or the DS not being balanced (I didn't get it spin balanced, but does it really affect vibes much with 31" BFG ATs?)
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Old January 15th, 2010, 02:36 PM   #6
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I get the vibes 35-40mph or so, and at high speeds. The high speed part may be due to tires being not balanced well enough (it's been a while) or the DS not being balanced (I didn't get it spin balanced, but does it really affect vibes much with 31" BFG ATs?)
35-40MPH and again at 65-75MPH could all be tire balance.

If the driveshaft were out of balance the vibration really shouldn't go away and should actually get worse at higher speeds.
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Old January 15th, 2010, 11:52 PM   #7
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sounds good...
:) In a couple months when the salt gets off the roads, I'll put the 31s back on (meanwhile getting them balanced) and get back to ya.
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