Eaton rear end gear swap

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Dirt101, Nov 24, 2021.

  1. Dirt101

    Dirt101 Bobtail Member

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    Aug 14, 2021
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    My truck currently has Eaton ds38 rear ends with 3.70 gears but I’m in the process of working out the details to swap my air ride for a walking beam setup that has Eaton 401 rears installed. They have 4.33 gears which won’t work for me, but I’m curious what are the chances I can swap my 3rd members into the walking beam housings?
     
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  3. dirthaller

    dirthaller Heavy Load Member

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    IIRC the bolt pattern on the hubs where the axles bolt on are different. I’ve been told that the the 380 housing won’t accept the newer axles (which is opposite of your problem). The 3rd member will bolt to the new (to you) housings but you might have to swap wheel ends (hubs) as well. Your question has me digging into 20 years ago memory LOL!
     
    Oxbow Thanks this.
  4. dirthaller

    dirthaller Heavy Load Member

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    ETA: I don’t think the splines on the shafts are the same either.
     
    Oxbow Thanks this.
  5. Dirt101

    Dirt101 Bobtail Member

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    Aug 14, 2021
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    I did attempt to dig this information up, and I believe the axle shaft splines are different but I was okay with transferring my 3rd member and shafts together. I believe I’ve got an extra gasket laying around so I will try to check the axle end bolt pattern tomorrow. Thanks!
     
  6. dirthaller

    dirthaller Heavy Load Member

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    I think the 380 is smaller pattern
     
  7. PSM379

    PSM379 Medium Load Member

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    Me and my buddy just swapped my 38s over to 40s was a direct swap, axles worked. So doing the opposite may work also.
     
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