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Old 01-25-2010, 06:22 PM   #1
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proper sye/tom wood shaft angles

can one of you experts take a look at this angle setup? Its an Advance adapters SYE and Tom wood cv rear driveshaft on a 97 tj with a RE 4.5 superflex.Had some vibs with this setup after removing the transfercase skid drop.
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Old 01-25-2010, 06:25 PM   #2
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Hard to say . . . can't see the pinion too well in the pic . . . what is the difference in the angles between the DS and pinion? You should be shooting for the pinion to be 1-2* under the DS. Do you notice the vibes when accelerating or decelerating or both?

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Old 01-25-2010, 06:33 PM   #3
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Yep, not enough of the rear pinion is showing to tell. The pinion angle kinda-sorta looks like it could be too low but it's just too hard to tell for sure from that photo.

We don't even necessarily need to see the front CV joint, we simply need to see the angle between the rear pinion angle and drivesahft to see if it is correct or not. The rear pinion angle should be the same as the driveshaft and not even a degree higher. The pinion shaft's angle can be as low as 1-2 degrees under that of the driveshaft but no more than that.

It should look just like the below illustration from Tom Wood's website.
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Old 01-25-2010, 07:05 PM   #4
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Let me see if I can get a closeup of the rear pinion.THe reason for asking is Im still running a thin (3/4") transfer case drop to get rid of vibs.Actually 1/2" worth of washers between the skid and frame did the trick,I just added a little more for good measure.Thanks for the quick replies.
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Old 01-25-2010, 07:08 PM   #5
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With a CV driveshaft, you won't need any transfer case drop to get rid of vibes when the rear pinion angle is correct.
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Old 01-25-2010, 07:18 PM   #6
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Why are you adding washers and lowering the T case vs. using the control arms to dial in the angles? You shouldn't need to lower the TC . . . for me anyway, that was the whole point in buying the CV DS, adjustable CAs, etc, so I didn't need to lower the TC.
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Old 01-25-2010, 08:10 PM   #7
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I did adjust pinion angle via upper control arm length.Set up arm length according to RE,s instructions,had vibs,so I shortened up the uppers to drop the pinion angle a hair to account for engine torque.This didnt seem to help.Dropping the transfer case did so I thought some of you guys might have a look....Heres a better shot
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Old 01-25-2010, 08:53 PM   #8
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lol.. take pictures of both the pinion and the TC output shaft together.
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Old 01-25-2010, 09:27 PM   #9
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lol.. take pictures of both the pinion and the TC output shaft together.
LOL..you mean like the one at the top of the thread.
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Old 01-26-2010, 12:34 AM   #10
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The angle of your last pic still makes it impossible to see the angle of the pinion angle & its relationship to the driveshaft. It needs to be as close to the side as possible, not from underneath.

Measure your driveshaft angle with an angle finder & then measure your pinion angle per the below pic. The rear pinion angle can be anywhere from 1-2 degrees lower than the driveshaft angle or exactly the same. But the pinion angle cannot point even a single degree above the driveshaft's angle.

The pic on the left shows the angle finder on the rear of the axle, measuring from that round circular flat spot that is on the left and right sides of the diff cover. The pic on the right is measuring on the driveshaft itself.
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Old 01-26-2010, 05:25 AM   #11
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Thanks Jerry,
sorry about the pics,trying to do it at night with a flashlight in one hand ,camera in the other.I have an angle finder like the one in your pics.There a little hard to read unless you can get your head directly across from it.I wonder if they make a digital one? I really want to get rid of that little TC drop....
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Old 01-27-2010, 10:42 AM   #12
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Thanks Jerry,
sorry about the pics,trying to do it at night with a flashlight in one hand ,camera in the other.I have an angle finder like the one in your pics.There a little hard to read unless you can get your head directly across from it.I wonder if they make a digital one? I really want to get rid of that little TC drop....
You should be able to get rid of that TC drop...might just take a bit of trial and error adjustments. I think they do make digital ones, but if you use it like Jerry has shown in the pics, you should be able to get a pretty accurate reading with the good ole under 5 bucks angle finder.
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Old 01-27-2010, 10:58 AM   #13
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Yep there's no need for a digital angle finder, the type in the above pictures is plenty accurate and fine for this job.

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