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FWD with no 3rd Member

Discussion in 'Technical Chat' started by drew02a, Jun 30, 2009.

  1. Jun 30, 2009 at 6:56 AM
    #1
    drew02a

    drew02a [OP] Rocking your mom's world Since 1997

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    Would it be bad for my rear axles and bearings to drive without a third member, a la Front Wheel Drive? My only concern is that there would be nothing to hold up the end of the axle shaft .

    I probably won't end up doing it because my new 3rd will be coming in this week and I don't feel like putting everything back together just to rip it apart again in a couple days. It would be nice to know for recovery if I ever destroy a set of gears or break an axle.
     
  2. Jun 30, 2009 at 8:00 AM
    #2
    luk8272

    luk8272 Poodoo

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    You could unbolt from the Tcase to the rear diff. Just 4 bolts on the diff, 4 bolts on the Tcase, and 2 on the hanger. The truck would be fine with the exception of having to turn the truck, bad for the front end, but technically could be done.
    Honestly I wouldn't risk it on a new truck. I did this on my 90 model truck for a week. It only drove about 12 miles total though.
     
  3. Jun 30, 2009 at 8:03 AM
    #3
    drew02a

    drew02a [OP] Rocking your mom's world Since 1997

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    Well, I don't have a hanger (regular cab), but it's kinda a given that you'd need to remove the rear drive shaft and have the Transfer case in 4 HI. Thanks for adding that part though.

    The item in question is really the damage to the rear wheel bearing or axles because the 3rd member isn't there to support the axles.
     
  4. Jun 30, 2009 at 8:09 AM
    #4
    luk8272

    luk8272 Poodoo

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    Sorry I missunderstood what you were asking. My bad. No I wouldn't do that. Big no no. Don't know what the heck I read, was talking to my 4yr old and typing. Sorry about that. Would like to delete that post, lol. But its a learning thing.
     
  5. Jun 30, 2009 at 8:10 AM
    #5
    Janster

    Janster Old & Forgetful

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    You are exactly right... there won't be anything supporting the axle shafts. I would NOT drive it without the 3rd member!!!!!!!!

    Here's a writeup on removing the 3rd member and it distinctly shows the axle shafts removed and the 3rd member is what supports the inner end of the shaft.
    http://www.atarmor.com/3rdmemwriteup/writeup2.htm
     
  6. Jun 30, 2009 at 8:10 AM
    #6
    drew02a

    drew02a [OP] Rocking your mom's world Since 1997

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    I thought about that a little, but I don't think the wear would be excessive. Usually the problem with having 4WD engaged on pavement is at the Transfer case. There is no differentiation between the front and rear. If only the front is engaged and you have an open front diff, then it should drive like any other FWD vehicle.
     
  7. Jun 30, 2009 at 8:11 AM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Edit.......I didnt read "3rd member"....I think that would be BAD.....
     
  8. Jun 30, 2009 at 8:11 AM
    #8
    drew02a

    drew02a [OP] Rocking your mom's world Since 1997

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    Thanks, that is a great write-up. I read it about a dozen times before I installed my autolocker a few months ago.
     
  9. Jun 30, 2009 at 8:13 AM
    #9
    luk8272

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    But like you said there wouldn't be anything supporting the axles. I haven't pulled one on a tacoma apart yet but it will likely be a clip of some sort that needs the 3rd member to hold the axles too. Without it they will be flying around in there.
     
  10. Jun 30, 2009 at 8:13 AM
    #10
    luk8272

    luk8272 Poodoo

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    Glad I was not the only one.
     
  11. Jun 30, 2009 at 8:13 AM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    :eek:
     
  12. Jun 30, 2009 at 8:18 AM
    #12
    drew02a

    drew02a [OP] Rocking your mom's world Since 1997

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    I am thinking too that it would be bad. That's why I didn't do it. Just wanted confirmation.

    The axles in the Tacoma aren't held in at the 3rd (C-clip style) they're held at the wheel. To remove, you just take off 4 bolts on the wheel assembly and pull it out.
     
  13. Jun 30, 2009 at 8:22 AM
    #13
    luk8272

    luk8272 Poodoo

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    I did not realize that. But I would still be leary of doing it.
     
  14. Jun 30, 2009 at 8:23 AM
    #14
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Right. Because if the 3rd is removed, the DS ends are just going to flop around and cause damage if driven on.
     
  15. Jun 30, 2009 at 8:25 AM
    #15
    drew02a

    drew02a [OP] Rocking your mom's world Since 1997

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    Here's what would happen if it were a C-Clip style diff.


    [​IMG]
     
  16. Jun 30, 2009 at 8:27 AM
    #16
    drew02a

    drew02a [OP] Rocking your mom's world Since 1997

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    What do you mean by DS Ends?
     
  17. Jun 30, 2009 at 8:45 AM
    #17
    drew02a

    drew02a [OP] Rocking your mom's world Since 1997

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    Yeah, that was already discussed though. I thought maybe he meant Drive Shaft, but again, already discussed the necesarry removal.
     
  18. Jun 30, 2009 at 8:52 AM
    #18
    drew02a

    drew02a [OP] Rocking your mom's world Since 1997

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    True, but I read somewhere that letting them just rest in the housing can mess up the seals.
     
  19. Jun 30, 2009 at 8:57 AM
    #19
    drew02a

    drew02a [OP] Rocking your mom's world Since 1997

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    I too have my doubts about whether it would really mess anything up or not. Have you removed your 3rd or axles before?

    I've always just removed them because it's not that big of a deal. The most annoying part is bleeding the brakes.
     
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