Is this odd with pinion angles? - JeepForum.com
 
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post #1 of 13 Old 10-30-2014, 09:25 PM Thread Starter
Beer_30
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Is this odd with pinion angles?

So I did a SYE with TW drive shaft but my angle was like 3 with no shim. It was ticking like a clock but loud when going just out of the driveway. Then I added their 8 shim and while it got better I still don't think it's enough. It doesn't tick but I have vibration now (scared to even get it past 15 mph). Do people really go 12? That's not odd? That 8 I thought was a lot.

I only have a 3.5 lift SUA.

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post #2 of 13 Old 10-30-2014, 10:37 PM
jokerchief462
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Here are a few pics to help out so the degrees only matter when installing the perches.

The degree of the shim to get the desired effect does matter.

If you need to to do a little reading go here

http://www.4xshaft.com/
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2joint_angle.gif   cv_angle.gif  

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post #3 of 13 Old 10-30-2014, 10:59 PM Thread Starter
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Thanks Joker. I've seen that image 100 times and been to Tom's site almost as much. Mine was like the first picture, maybe slightly up. Then I added the 8 to bring it to almost the second pic. The only way to get to that angle in the second pic is to add 12 shim and maybe drop the TC which defeats the purpose. I talked with TW today and he suggested I get 12 if I'm off like I say. I just thought that is so over the top and wondered if anyone ran that.
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post #4 of 13 Old 10-30-2014, 11:13 PM Thread Starter
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Actually I just went and took a picture
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post #5 of 13 Old 10-31-2014, 05:01 AM
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The easiest way to do it is get an angle finder. Find the angle of your pinion and the angle of your d/s. Then get what ever shim will give you 1-2 degrees less angle on your pinion than your d/s. Thats it, not really any other way. unless you want to cut and re-weld your purches.

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post #6 of 13 Old 10-31-2014, 08:16 AM
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Obviously you didn't do your research before you installed the slip yoke, or you would have known that with a CV your pinion points right at the output yoke, and it isn't ridiculous at all. If you leave the angle like it is in that picture you're just going to cause premature wear on your driveshaft. The whole point of the CV is to take the driveshaft angle and put it in the CV joint, not to keep the angle like it was before
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post #7 of 13 Old 10-31-2014, 08:43 AM
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The way you achieve the proper angle is to use the spring perches as the adjuster. By moving the axle pinion up or down to set this angle.
They, the perches, are not welded on during this adjustment.
Then, weld the axle perches in this location to finalize the angle.

No shims are used, no tc drop is used.
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post #8 of 13 Old 10-31-2014, 09:37 AM Thread Starter
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Quote:
Originally Posted by baktie_91YJ View Post
Obviously you didn't do your research before you installed the slip yoke, or you would have known that with a CV your pinion points right at the output yoke, and it isn't ridiculous at all. If you leave the angle like it is in that picture you're just going to cause premature wear on your driveshaft. The whole point of the CV is to take the driveshaft angle and put it in the CV joint, not to keep the angle like it was before
There's nothing more I could have looked up. I talked with Advance Adapters for an hour at least. I talked with TW's guys like 4 times. They determined what I needed. Why research anymore when I talked to the sources of both parts? They told me what could happen and every jeep is different. They guessed 8 and were close.

To keep using these shims, I would have to lower the TC but not an inch like before you think?
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post #9 of 13 Old 10-31-2014, 10:26 AM
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Yeah that pic shows your angle to low. You want to be pointed straight at the CV joint and down 2 degrees to allow for engine torque.
I have done a bunch of 8.8 and SYE and thats how i do it with no vibs...
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post #10 of 13 Old 10-31-2014, 10:31 AM
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What shims are installed in the picture?

How thick are 12 deg shims? At some point it does make more sense to re-position the spring perches.

Did you use a short SYE kit? It make the DS a little longer and cuts down the DS angle.

Anyway , you are talking to the right guys (TW). They will get you straightened out.
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post #11 of 13 Old 10-31-2014, 05:36 PM
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if it makes any difference my pinion sits at 19* no shims the perches are welded that way. you need to go higher than where it is at by at least 5* (thats by eyeballing it.)


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post #12 of 13 Old 10-31-2014, 08:15 PM
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I see new springs in the photo too, so things will likely change in 6 months. The best approach is to find a buddy that welds and can help you put new perches (cheap) on at the right angle. To me, shims and/or t-case drop are just a temp fix until you can do it right.

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post #13 of 13 Old 11-01-2014, 10:46 PM
Gausswave
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Another ting that will affect the drive angle is you want to set it trail weight loaded.
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