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Old 10-16-2013, 02:05 AM   #1
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help!! driveshaft question

i have a 2005 tj with about 5" of lift. i was getting some moderate vibrations. today i installed a rugged ridge sye kit and a dc driveshaft. found the driveshaft on ebay for 140 bucks used. well, when i went to bolt on the driveshaft, it was a **** hair too long. it was now 1am and i was frustrated so i lifted the transmission up a tad and got driveshaft on. it wasnt lacking much. once i got the u joint in the yoke where it goes i could move the driveshaft back and forth about 1/16". well, now the vibrations are worse. does the driveshaft need to be shorter to allow the suspsension to work? the ujoints were used. they felt and looked alright.
oh, i do not have adjustable control arms. the pinion is pointed roughly 5 degrees south of the driveshaft.

any help would be appreciated!

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Old 10-16-2013, 10:35 AM   #2
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if you're installing a sye you need (at minimum) adjustable rear arms in order to set the pinion angle...

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Old 10-16-2013, 11:03 AM   #3
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Sounds like you have two issues. Under power, the rear axle will rotate up, and 1/16" of play in the drive shaft splines isn't enough for the axle rotation and uneven road surfaces. Plus as mentioned above, you need adjustable control arms in the back so you can match the pinion angle to the drive shaft angle. Along with that, you will need an angled track bar bracket to allow the axle to rotate without binding the track bar bushing.
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Old 10-16-2013, 11:35 AM   #4
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It might have been cheaper for to to have ordered a new driveshaft with the correct measurement/length. But you can still take your shaft to a driveshaft shop to have it cut to size and balanced.

I'm thinking in your current state, if you articulate - the rear up travel may cause your driveshaft to bind.
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Old 10-16-2013, 01:37 PM   #5
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Quote:
Originally Posted by Water Dog View Post
Sounds like you have two issues. Under power, the rear axle will rotate up, and 1/16" of play in the drive shaft splines isn't enough for the axle rotation and uneven road surfaces. Plus as mentioned above, you need adjustable control arms in the back so you can match the pinion angle to the drive shaft angle. Along with that, you will need an angled track bar bracket to allow the axle to rotate without binding the track bar bushing.
Quote:
Originally Posted by IslandTJ View Post
It might have been cheaper for to to have ordered a new driveshaft with the correct measurement/length. But you can still take your shaft to a driveshaft shop to have it cut to size and balanced.

I'm thinking in your current state, if you articulate - the rear up travel may cause your driveshaft to bind.
As said, if it was that tight getting the driveshaft in it would def be causing the driveshaft to bind or bottom out when your suspension is working, and it is working whether you are on road or off. As also mentioned you need at a minimum upper adj control arms to adjust pinion angle. Lowers will help set axle position. Then once you rotate the axle to adjust the pinion angle then you should get an angle correction track bar bracket as waterdog stated.


Also you stated that you bought a used driveshaft, it is a double cardian driveshaft correct?
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Old 10-16-2013, 01:37 PM   #6
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Guess I need to order some parts and shorten my shaft. Thanks for the help everyone.
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Old 10-16-2013, 02:26 PM   #7
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yes it is a double cardian driveshaft. i would be better off getting upper and lower adjustable control arms?

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driveshaft , help needed , u-joint , vibrations

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