How did the factory attach the housing ends?

Transmission and Drivetrain Tech

  1. Ol'forest

    Ol'forest Well-Known Member

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    How did the factory attach the housing ends on the 8 3/4? I can't see welds, looks smooth almost like one piece with the rest of the housing. Surely it fit over or inside the tube and then was welded somehow? Anyone have some actual knowledge on how the factory did it?
     
  2. Projectile Dart

    Projectile Dart Well-Known Member

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    Can you post a picture of where you are referring to? On my 8 3/4 the welds are not only visible, but surprisingly sloppy from the factory
    housing-ends.jpg
    These are how the housing ends should look, the chamfered edge would butt up against the housing tube and then be welded on at that point
    At the risk of oversimplifying, the rest of the housing is only 1 piece
    These rear ends are not like a Dana style rear where you have a large cast center section where you press axle tubes into them
     
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    • Tims 66 Cuda

      Tims 66 Cuda Mopar mid life crisis

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      Projectile Dart is right. You also need some type of jig for housing to keep the flanges square during welding.

      Tim
       
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      • Dana67Dart

        Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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        I believe the housing ends on an OEM 8 3/4 housing are formed into the tube that is created from flat stock. There are crimp marks where the tube is held while the forming happens.

        This is how I think the housings are made.

        1. Flat stock is rolled into a tube and welded down its length. (This can be seen inside the housing tubes)
        2. One end is split front and back length wise a foot or so 90 deg from the weld.
        3. That end is formed into the upper and lower half of the center.
        4. This is repeated for the other side tube.
        5. Another piece of flat stock is formed into a dish making the rear of the housing
        6. The two tubes and the dish are welded together.
        7. A ring is cutout and welded to the front side of the housing where the center section gets bolted up.
        8. The mounting holes are punched into the ring.
        9. The breather hole is punched and threaded.
        Now for the ends, this is a guess but would be a way to make many housings that could then be made to the needed width for A B C E body cars.
        1. The housing that is longer than needed is cut to a length specific to the car body.
        2. The end is then heated and formed to the shape of the end flange.
        3. It is machined and the holes punched
        4. The spring perched are welded on.
        Alternately the flat stock is cut to length before the tube is formed, and the ends are formed into the tubes before the two halves and the dish are welded together.
        Finished housing.

        I have two bare housings and both have the same crimp marks, weld lines, etc.

        Crimp marks
        PXL_20201217_044940513.jpg PXL_20201217_045001021.jpg

        Weld line outside
        PXL_20201217_045051964.jpg

        Weld line inside
        PXL_20201217_045153482.jpg

        1/2 tubes welded together
        PXL_20201217_045112715.jpg
         
        Last edited: Dec 16, 2020
      • Dana67Dart

        Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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        If your ends are welded on you have a modified housing.
         
      • pishta

        pishta I know I'm right....

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        My 8.75 had a leak right at that weld on the bottom. Always a quarter size spot on the ground when I parked for longer than a weekend.
         
      • Dana67Dart

        Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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        The welds on the housings are shitty at best, both of my housings have very similar welds. Not surprising it leaked
         
      • Ol'forest

        Ol'forest Well-Known Member

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        Does anyone know if the ends are the same for tapered axle earlier 8 3/4s as the later?
         
      • RustyRatRod

        RustyRatRod I didn't do it. FABO Gold Member

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        Nope. Totally different.
         
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