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Old 10-23-2013, 07:09 PM   #1
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cv driveshaft bent?

i put a sye kit and bought a used cv driveshaft. had the driveshaft balanced and new ujoints installed. when you grab the double joint with your hands and try to move it around it gets stuck . it didnt seem right to me. anyways i installed it on my jeep and has a bad vibration starting at 20 mph. in 4high with no rear driveshaft there is no vibes at all. before i installed the sye kit i had a little vibrations at 60 mph. do you think the driveshaft is jsut fucked up? you should be able to move the joints all around with your bare hands correct? i feel like a dumb ass for posting this but wana makes sure before i spend the money on another driveshaft. thanks for taking time to read this...

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Old 10-23-2013, 07:39 PM   #2
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With new u-joints, it should move smooth. Can you tell is it a u-joint binding, is everything seated in there properly?

Did you also adjust your rear pinion angle? It will need to be higher than stock after adding a SYE & CV driveshaft.

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Old 10-23-2013, 08:14 PM   #3
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Originally Posted by Shark_13 View Post
With new u-joints, it should move smooth. Can you tell is it a u-joint binding, is everything seated in there properly?

Did you also adjust your rear pinion angle? It will need to be higher than stock after adding a SYE & CV driveshaft.
i think the ears of the joint is out of whack somehow. i tried changing the ujoints myself but had a hard time getting the last one in because it wasnt quite lining up right. like it was bent or something. thats why i took it to the driveshaft place. i did not adjsut my pinion angel up. i dont have adjustable control arms yet. the angle is about 5 degrees south of the shaft. would that make it vibrate that bad at low speeds?
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Old 10-23-2013, 08:15 PM   #4
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Originally Posted by Shark_13 View Post
With new u-joints, it should move smooth. Can you tell is it a u-joint binding, is everything seated in there properly?

Did you also adjust your rear pinion angle? It will need to be higher than stock after adding a SYE & CV driveshaft.
i think the ears of the joint is out of whack somehow. i tried changing the ujoints myself but had a hard time getting the last one in because it wasnt quite lining up right. like it was bent or something. thats why i took it to the driveshaft place. i did not adjsut my pinion angle up. i dont have adjustable control arms yet. the angle is about 5 degrees south of the shaft. would that make it vibrate that bad at low speeds?
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Old 10-23-2013, 08:26 PM   #5
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This page explains the difference between the stock setup, and switching to the CV style. It shows how each has to be aligned.

http://www.4xshaft.com/driveline101.html

Generally, with the SYE/CV, the pinion needs to be within 1 - 2 degrees of the drive shaft. Most guys set the pinion slightly low as it will raise up with the drive torque.

Grab a magnetic angle finder ($8 or so) and see what you got.
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