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Driveshaft balance 200

posted by  TempleUWS6 on  Mon Apr 7 08:19 CST 2014
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last visit: Thu Oct 23 20:30 CST 2014
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So my rear u-joint began to seize on my DD 245 so I swapped the whole DS from one of my project cars. I still get a slight vibration from the saft, whats the best way to get rid of this? Do I have to pull the flanges and resurface them?








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    Driveshaft balance 200

    posted by  derek uk on  Wed Apr 9 05:55 CST 2014
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    last visit: Fri Oct 24 12:33 CST 2014
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    When you say "the whole drive shaft" do you mean just the rear section or both parts? Front and rears are balanced together, so it's pot luck if you just swap one part. Plus one to checking the phasing.








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    Video demonstration 200

    posted by  SwedeFreak on  Mon Apr 7 13:25 CST 2014
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    last visit: Tue Sep 30 18:15 CST 2014
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    If you leap to 14:40 of this video you will see the method of assuring balanced assembly. He even weighs the hardware at the end.

    http://www.youtube.com/watch?v=L5_4u5M3Ct8








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    Driveshaft balance 200

    posted by  Volvo From Heck on  Mon Apr 7 12:33 CST 2014
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    last visit: Mon Oct 13 20:56 CST 2014
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    The first thing would be to make sure the driveshaft halves are in phase with each other. A multi-section driveshaft should have the very first yoke (the the one bolted to the output flange on your trans) and the very last yoke (the one bolted to the diff flange) align as if there were a u-joint attaching them (that is- at 90 degrees to each other). That leaves the rear section with two possible correct visual alignments--but only one of those is the actual balanced alignment. A driveshaft from a parts car/project car has been on and off how many times? :-) -- Dave








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      Driveshaft balance 200

      posted by  TempleUWS6 on  Mon Apr 7 12:49 CST 2014
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      last visit: Thu Oct 23 20:30 CST 2014
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      Ok, that makes sense, I'll have to see if they are aligned properly.

      On another note, what spec should the yoke bolts be torqued down to?








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        Driveshaft balance 200

        posted by  Volvo From Heck on  Mon Apr 7 16:38 CST 2014
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        last visit: Mon Oct 13 20:56 CST 2014
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        "On another note, what spec should the yoke bolts be torqued down to?" I don't know that any specific torque is needed. They need to be TIGHT. A pair of six inch wrenches will not do it. You need good fitting wrenches about 8-10 inches in length and then squeeze them together as tight as you can make them. -- Dave







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