1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Leak at front shaft slip joint?

Discussion in '1st Gen. Tacomas' started by geodude, Sep 18, 2013.

  1. Sep 18, 2013 at 10:53 AM
    #1
    geodude

    geodude [OP] Well-Known Member

    Joined:
    Aug 18, 2013
    Member:
    #110690
    Messages:
    91
    Gender:
    Male
    Could anyone tell me what this fluid is that's coming out from my front driveshaft slip? There's only a very little bit of it that dripped down onto the cross-member below it, and it's an oily consistency with a reddish hue (see pic).

    I did just hit all my chassis zerks with some grease, definitely not overgreased, so I was figuring this could be a little grease contaminated moisture that might have been pushed out? I know some grease might come out of there while greasing, but I only ask because this is a little more viscous than just grease.

    Possibly a stupid question, but this shaft isn't filled with fluid from the transfer case or front diff is it? Because then this may be of concern.

    Appreciate it

    [​IMG][​IMG]
     
    Last edited: Sep 18, 2013
  2. Sep 18, 2013 at 11:45 AM
    #2
    obscurotron

    obscurotron Well-Known Member

    Joined:
    Apr 29, 2012
    Member:
    #77839
    Messages:
    439
    Gender:
    Male
    Bay Area, California
    Vehicle:
    '14 DCSB 4x4
    There's no diff fluid in the front driveshaft of a 1st gen Tacoma. If you look, the front shaft has a u-joint where it bolts on to the front diff flange, and the same for the transfer case. It would be magical if fluid could span the air gap and make it in there, but despite our advances in quantum physics, it ain't happening. ;-) At least this is what I recall from my 2004.

    Here's a brief grease lesson. Grease is generally a combination of a base lubricant (an oil) and a thickener (often a soap-based compound). Automotive grease, at least, is thixotropic. That means in its resting state, grease is a glob of oil emulsified in the soap thickener. When grease is sheared, it's viscosity drops to near (but usually not quite) the viscosity of the oil used to make the grease.


    As you keep shearing this grease over and over again, the emulsified combination of soap+oil breaks down and the two separate. Ever seen really old, nasty grease from inside a u-joint? It's thicker and stickier than fresh grease - most of the oil has been sheared out of it, leaving behind mostly the soap base. What I *think* you're seeing there is the result of putting in fresh grease - the old, sheared grease (aka 'oil') is working it's way out of the shaft. Being less viscous, the oil will dump out first, and the soap base may or may not ever make an appearance.


    If you want to be certain (and be good to your truck) drop the front drive shaft (mark it's orientation on both flanges and the slip yoke, first), take it apart, clean out all the old grease, put in fresh grease, and re-install. That's probably overkill, but you'll know for sure.
     
  3. Sep 18, 2013 at 1:19 PM
    #3
    geodude

    geodude [OP] Well-Known Member

    Joined:
    Aug 18, 2013
    Member:
    #110690
    Messages:
    91
    Gender:
    Male
    Thanks obscurotron, I always appreciate a good science lesson. I don't think I'll be dropping the shaft, but thanks again for the info.
     
To Top