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Old 10-12-2012, 06:23 PM   #1
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Is my driveshaft to short (life story giggidy)

04 Rubicon auto 3" savvy lift 1.25 body lift. 2" aluminum undercover fab skids using stock t case mount. Tom woods driveshaft in rear from savvy when I did major order.

Just had 4.88 gears installed. Had issues and long story short he did redo them with new gears because they wore bad and shimmed wrong. So with that said its been better instead of the bad WHINNEEESSSS it had but also a bad vib over 65 or so... So with it new and rebuilt its no more whine but it still has a bad vibe. I am going nuts with pinion angles and they can't be more spot on. I have a new idea that may be an issues or not. When I ordered the lift and driveshaft , and ordered a driveshaft for a 3" lift be way to short for a 3" lift along with moving the transfer case up 2+" from stock location or more. If the shaft is to short perhaps not enough in the splines or who knows. Anyone have some input?

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Old 10-12-2012, 07:30 PM   #2
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Do you have an SYE?

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Old 10-12-2012, 07:32 PM   #3
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Its a rubi so it comes with a double cardan cv shaft
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Old 10-12-2012, 07:35 PM   #4
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Stock rubi comes with a fixed yoke. Therefore, there is no SYE since it never had a slip yoke to eliminate. I see the OP says he ordered an aftermaret drivesaft so I'm assuming it is a double cardan. The stock rubicon does not come with a double cardan shaft it has a single u joint on each end. OP try removing the rear u joints and see how far the splines extend into the t case.
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Old 10-12-2012, 07:53 PM   #5
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Quote:
Originally Posted by ohsixlj
Stock rubi comes with a fixed yoke. Therefore, there is no SYE since it never had a slip yoke to eliminate. I see the OP says he ordered an aftermaret drivesaft so I'm assuming it is a double cardan. The stock rubicon does not come with a double cardan shaft it has a single u joint on each end. OP try removing the rear u joints and see how far the splines extend into the t case.
Yes I purchased a Tom woods driveshaft. My tcase has a fixed flange off of it, and yes a double Camden shaft mounted to it to my rear axle.

Remove rear driveshaft u joints or do you mean just remove the shaft to check. I plan to do this tomorrow rear first, then try the front as well. As for splined into tcase it's fixed so how do I see there is no slip to it. My OP refers to the Tom woods shaft itself being perhaps to short so it's at maybe max length just to reach the rear axle.
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Old 10-12-2012, 07:56 PM   #6
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Quote:
Originally Posted by CMA_Rider View Post
Its a rubi so it comes with a double cardan cv shaft
While Rubicons have no need for a SYE kit, they don't come with a CV driveshaft. Rubicons come with a conventional single-Cardin two u-joint driveshaft, one u-joint at both ends.
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Old 10-12-2012, 07:58 PM   #7
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Quote:
Originally Posted by Jerry Bransford
While Rubicons have no need for a SYE kit, they don't come with a CV driveshaft. It comes with a conventional single-Cardin two u-joint driveshaft, one u-joint at both ends.
Well spoken Jerry but I was waiting for you to chime in on this. Any input on my issue. This pulsing driveline vibe is really making me wanna set fire to this jeep and just start over.
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Old 10-12-2012, 08:06 PM   #8
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Pulsing vibes are usually an indication of one of two problems... an incorrect rear pinion angle which is most likely, or a bad u-joint.

Your rear pinion angle must look like the below... the pinion shaft should point directly at the t-case's output shaft.... no higher, no lower.
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Old 10-12-2012, 08:06 PM   #9
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Sorry I was in the middle of an edit when I realized u already stated it was an aftermarket drive shaft and I didn't take out the last line about splines in the t case. Either way its the same idea. Try to measure the amount of slip u still have. Hope this helps

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