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Unread 08-02-2010, 08:56 PM   #1
Splinter
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Please comment on this drive shaft angle

I am building a CJ5 on which the PO did a spring over. The geometry of the drive shaft does not look proper. The diff is angled up. I have only driven it around the yard. When backing up there is a terrible shudder. Will a double cardan fix this problem? How does it go onto the drive shaft. Thanks for any info.

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Unread 08-02-2010, 09:07 PM   #2
jcal73
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Looks like the diff is set up for a double cardian allready.

The double is a complete assembly to replace your shaft.

Look at this link, it has some really good pics and from what I hear they are a good vendor as well

JEEP CV DRIVESHAFT DANA 300 - 20 COVERSION CJ DRIVELINE: eBay Motors (item 250664213092 end time Aug-09-10 08:44:27 PDT)

For a regular set up the joints need to be in the same plain.

Like this

I------I or /--------/ or \---------\

Not like this

/--\ or I---------\ or /------------I

I saw a really good PDF on here a while back from a guy on here called gojeepin PM him and I bet he would email it to you.

Jeff
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Unread 08-02-2010, 09:18 PM   #3
jcal73
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Found the link,

If your jeep has a PO installed springover you need to read this!

http://www.jeepforum.com/forum/f8/ef...in-etc-784807/


Jeff
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Unread 08-02-2010, 10:16 PM   #4
Pacfanweb
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It's double CARDAN, or CV.

That's a fairly steep angle, from the looks of it. Have you put an angle finder on the shaft to see what it is?

Don't know about it being set up for a CV already....for a CV, you want the pinion angle to be a couple degrees less than the shaft angle...that one looks to have more than just a degree or two of difference.
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Unread 08-02-2010, 10:55 PM   #5
MisfitSeven
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looks like your e brakes are not hooked up.
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Unread 08-03-2010, 04:50 AM   #6
jcal73
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Quote:
Originally Posted by Pacfanweb View Post
It's double CARDAN, or CV.
At least I didn't call it a cardigan!



Thanks for the correct spelling.!

Jeff
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Unread 08-03-2010, 09:06 AM   #7
Splinter
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Thank you all for the valuable info. Jeff, that link is really helpful.
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Unread 08-03-2010, 09:17 AM   #8
Pathkiller
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It's not that the angle is too steep (it's about par for the course on a CJ5), it's the fact that the angles don't match. The front and rear u-joints need to be running at the same angle. As it is you have maybe a 30 angle in front and maybe 5 in rear. This will cause severe vibration and u-joint failure.
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Unread 08-03-2010, 12:48 PM   #9
JeepnBlake
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Go with the double cardan, You can get an xj front drive shaft for 50 and the junk yard, get it cut down another 50 and then you just need a yoke for the drive shaft. If you can get the yoke too then you don't need to buy one, but if they won't sell it to you, you can get one online fairly inexpensively.


http://www.jeepforum.com/forum/f8/da...-links-894019/
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Unread 08-03-2010, 01:21 PM   #10
Splinter
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Quote:
Originally Posted by Pathkiller View Post
It's not that the angle is too steep (it's about par for the course on a CJ5), it's the fact that the angles don't match. The front and rear u-joints need to be running at the same angle. As it is you have maybe a 30 angle in front and maybe 5 in rear. This will cause severe vibration and u-joint failure.
I am wondering why the PO tilted the diff upwards. Had he left it parallel with the frame it would have been much better. Right?? However then it might have been too short??
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Unread 08-03-2010, 01:30 PM   #11
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Quote:
Originally Posted by Splinter View Post
I am wondering why the PO tilted the diff upwards. Had he left it parallel with the frame it would have been much better. Right?? However then it might have been too short??
My guess is the PO was planning on a DC drive shaft.

You have to establish what the PO did to rotate the axle like that.

Are there shims (wedges) between the leaf pack & the spring/shock plate?

Also, are you planning on leaving the Jeep SOA or returning it to SUA?

FT
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Unread 08-03-2010, 05:34 PM   #12
Pacfanweb
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Quote:
Originally Posted by Splinter View Post
I am wondering why the PO tilted the diff upwards. Had he left it parallel with the frame it would have been much better. Right?? However then it might have been too short??
No. Even a stock pinion angle is higher than // to the frame.

You want 1-3 degrees lower than the driveshaft angle, according to most experts.

Whether you need a CV joint or not depends on the angle, but if you need one, they usually want to have almost no pinion angle.
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