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Drive Shaft Slip Travel

Discussion in 'Early CJ-5 and CJ-6 Tech' started by kenb, Feb 11, 2019.

  1. Feb 11, 2019
    kenb

    kenb Member

    Detroit
    Joined:
    Jan 22, 2019
    Messages:
    103
    How much slip travel should a CJ5 driveshaft (propeller shaft?) have front and rear? I just took my M38A1 off about a 4" lift and returned it to stock height. I don't know if the previous owner had put extra long drive shafts on it for the lift. They both appear to have about 1.25" of travel available before they bottom out. This is when the vehicle is sitting on the ground. When it sits on the ground the axles are about 5" below the bump stops. Any thoughts are appreciated.
     
    Last edited: Feb 11, 2019
  2. Feb 11, 2019
    hooliganrick

    hooliganrick Sponsor Sponsor

    San Diego, CA
    Joined:
    Apr 14, 2012
    Messages:
    99
    Hey Kenb….I have my rear driveshaft in the shop now, having it shortened by 1/2". I seem to have the same situation as you. I replaced the leafs when I got it. Well as they have worn in, the driveshaft is pretty much bottomed out with the jeep sitting, no load, and I have picked up a subtle vibration at 35mph. So I figured the PO might have installed a longer shaft. I came up with the 1/2" from talking to a couple of shops. So we'll see when I get it back in. Hope this helps.
     
  3. Feb 11, 2019
    mike starck

    mike starck Member Sponsor 2019 Sponsor

    salem,oregon
    Joined:
    Jun 22, 2006
    Messages:
    602
    Maybe just draw a diagram on the shop floor with a little chalk.Should give a idea of about how much change with the travel. Chalk and string .retro
     
  4. Feb 11, 2019
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
    Joined:
    Aug 13, 2015
    Messages:
    3,056
    I wouldn't necessarily trust what you see. You might want to pull an end off and collapse the shaft to see where it really bottoms. It might bottom internally well before you'd think.
     
  5. Feb 11, 2019
    Warloch

    Warloch Did you say Flattie??? Staff Member Sponsor

    Falcon, CO
    Joined:
    Mar 4, 2003
    Messages:
    4,389
    I was having issues when I put the Holbrooks on with the SM465 and the front bottoming out with a modified stock slip shaft - busted a bellhousing that way. Now when I get new shafts for my conversions, I just go to Tom Woods and get the extended setup.
     
    Rich M. likes this.
  6. Feb 11, 2019
    47v6

    47v6 junk wrecker! Sponsor

    Washington DC.
    Joined:
    Oct 25, 2006
    Messages:
    4,364
    Good Price, Great service, quality driveshaft.
     
  7. Feb 13, 2019
    kenb

    kenb Member

    Detroit
    Joined:
    Jan 22, 2019
    Messages:
    103
    Thanks for the replies. I disconnected both shafts today and measured their compressed lengths. As the jeep sits on the ground they both have a little more than an inch of travel. By my math at maximum compression of the suspension they should have more than half an inch to spare. So it appears they should be OK.
     
    ITLKSEZ likes this.
  8. Feb 14, 2019
    nickmil

    nickmil In mothballs. Sponsor

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    11,410
    CJ Tatton builds great driveshafts also. Good quality with long travel and good prices. Tattons Drive Lines
     

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