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Unread 05-30-2015, 04:13 PM   #1
jakerz
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Driveshaft Question

Hello, I have a 1999 XJ Classic that I purchased recently that has a few modifications and was wondering if this is a stock driveshaft?

I've been doing some reading and want to purchase a SYE and double cardan driveshaft. However, it looks as if it already has a double cardan DS. Not sure what's exactly going on and would love some advice/direction. It's a 231 t-case and a D35 axle. Thanks!





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Unread 05-31-2015, 08:17 AM   #2
Rebel442
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You definitely have a DC drive shaft with a slip built into it. However it looks like you have a slip yoke on the T-case still too. Maybe its just a weird boot looking thing that's throwing me off. Best way to tell would be to remove the driveshaft.


edit: More I look at it its got to be a SYE. Maybe a hack and tap?
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Unread 05-31-2015, 08:29 AM   #3
jakerz
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I think that's what is throwing me off too.

So, if I disconnect the DS and the yoke slides completely out of the T-case, I would have a slip yoke, correct?

If it does slide out, can you just slide it back in without hurting anything? (That sounds kind of dirty, ha)

If it does slide out, would I be able to just buy a SYE and reuse the current DS setup?

Thanks again for all the help!
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Unread 05-31-2015, 08:36 AM   #4
CJ7-Tim
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It looks like you already have a Hack and Tap SYE. Is the T-case yoke bolted on ?


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h-t-1.jpg  
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Unread 05-31-2015, 09:40 AM   #5
jakerz
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I'll have to look. If it is bolted on, I would need to remove the center yoke (that houses the 2 u-joints) and there should be a center bolt in the yoke that's connected to the output shaft of the t-case, correct?

Either way, it sounds like the best bet would be to disconnect the DS and see if the output shaft slides in and out. I'll do that here in a few and report back. Thanks again.
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Unread 05-31-2015, 10:41 AM   #6
jakerz
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It looks like there is definitely a bolt in the center of the yoke on the t-case shaft. Guess it's a hack-n-tap, right? I'm still getting some vibes at highway speeds. They're not horrible. But they are there. I'll take a pic of the DS angle. Here's a pic of the bolt I was talking about on the yoke.

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Unread 05-31-2015, 10:59 AM   #7
jakerz
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I just measured it and my DS is at an 18* angle. It doesn't look like its binding anywhere. Here's a few pics. Any ideas? Or am I good to go and I'm just being too picky? Thanks again!



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Unread 05-31-2015, 11:25 AM   #8
CJ7-Tim
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The pinion angle is a bit low, that may or may not be the source of the vibes.

Start your diagnostics by removing the front axle drive shaft and test drive over the same roads that has the vibes. Inspect the u-joints on the front driveshaft. Next, install the removed front driveshaft onto the rear axle and test drive again. Inspect the u-joints on the rear driveshaft. These steps will help determine if the front axle driveshaft is the source of the vibes (by step 1), or if the rear driveshaft is the source (by step 2). Worn u-joints, a worn double cardan assembly, or a worn slip yoke can be the source of the vibes, but you have to determine if one/both/neither driveshaft is the source.
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Unread 05-31-2015, 12:25 PM   #9
jakerz
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Awesome. Thanks for the advice! I'll give that a shot and start narrowing it down.
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