1. ValiantKindOfGuy

    ValiantKindOfGuy Active Member

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    What am I looking at here? True 4 speed or overdrive unit?

    FFD8B3C1-EAB1-4A77-AA88-1687AF7305D9.jpeg
     
  2. Alaskan_TA

    Alaskan_TA Well-Known Member

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    Post a clear photo of all the numbers on the flat pad at upper right as well as the tail shaft from the opposite side.
     
  3. ValiantKindOfGuy

    ValiantKindOfGuy Active Member

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    Okay this is all i got from the guy. I will get more if he sends them.
     
  4. Rainy Day Auto

    Rainy Day Auto Fabo resident FABO Gold Member

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    the aluminum ones are 26 spline output and the cast are 30 spline output.

    The only time the aluminum was used was in light cars like the aspen/volare and Late A.

    Any truck or van or 75 and 76 A/F were cast. So the vast majority of them out there are cast. Cast iron cases used 99129 part number which is the same number used on the earlier close ratio cases.
     
    Last edited by a moderator: Nov 8, 2019 at 9:34 AM
  5. mbaird

    mbaird mbaird FABO Gold Member

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    I would say the vast majority of O.Ds I have seen are aluminum.
     
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    • Dfr360cuda

      Dfr360cuda MAGA Again

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      One shift lever up
      The other one down
       
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      • brian6pac

        brian6pac Well-Known Member

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        I have one of each that belongs to a friend of mine, the aluminum is a 26 spline and the cast is a 30 spline output, from what I understand the cast ones are a lot stronger in general.
         
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        • ValiantKindOfGuy

          ValiantKindOfGuy Active Member

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          52E93BB5-A4D3-4431-8B0A-F10C9510B78A.jpeg This is another picture of the whole pad.
           
          Last edited: Nov 8, 2019 at 8:31 AM
        • j par

          j par Well-hung Member

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          I have to disagree with that not that it's not true in a real Overdrive but for goodness sakes don't let somebody just flipped the third fourth leave her over on an overdrive and tell you it's a regular for Speed..
           
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          • j par

            j par Well-hung Member

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            The input shaft retainer is usually larger on an Overdrive. A measurement of that is I could tell tale sign.. if you're paying good money for it I would want to open the side case. It's only 10 bolts and it pops off easy. If the gears progressively get smaller then it is a 4-speed. If one of the middle years is way larger and it doesn't get smaller to larger evenly across the gears it's an Overdrive.. besides that you want to look inside of it and make sure it's all clean and oily and not Rusty and been sitting around...
             
          • ValiantKindOfGuy

            ValiantKindOfGuy Active Member

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            B592FF49-AE71-4271-8A39-79153F9956DC.jpeg
             
          • ValiantKindOfGuy

            ValiantKindOfGuy Active Member

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            And finally the tailshaft.

            CF45B9D0-A03C-4760-9A0E-01439B1D921E.jpeg
             
          • j par

            j par Well-hung Member

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            Honestly if he's sending you these vague pictures of numbers and not the whole transmission and the front of it and everything like that I would be leery...
             
          • ValiantKindOfGuy

            ValiantKindOfGuy Active Member

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            I’m just looking for what it is. Is it an A Body? Is it an overdrive(unlikely) it’s a 3 hour drive and the guy got it in an estate sale he has no idea exactly what it is. I’ve been looking for one for my 4 speed swap and this one is cheap.
             
          • Dfr360cuda

            Dfr360cuda MAGA Again

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            /////////////////////////////////////////
            Yep, I didn't think of that.
            I assumed everyone was honest.
            I have the Passon transmission book out in the garage.
             
          • 66340SEDAN

            66340SEDAN FABO Member #3649

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            I thought the Plymouth Feather Duster and Dodge Dart Lite models all had an aluminum overdrive to save weight for better fuel mileage?
             
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            • 66340SEDAN

              66340SEDAN FABO Member #3649

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              Need pictures of the entire trans
               
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              • Dfr360cuda

                Dfr360cuda MAGA Again

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                What about shift the gears.
                Turn the input shaft, watch the output shaft.
                Count the number of revs going in to what's coming out.
                 
              • Rainy Day Auto

                Rainy Day Auto Fabo resident FABO Gold Member

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                Every 75 and 76 OD I have ever had were cast iron. I was under the impression they only made cast iron in those years. I did have an aluminum unit but it was a 1978. So I would say they were cast.
                 
              • toolmanmike

                toolmanmike FABO Staff Staff Member FABO Gold Member

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                I just read:
                Chrysler’s full-size and mid-size 1963 models were the first to feature an available four-speed transmission. The 318, 361 and 383 V-8 engines used the familiar Borg-Warner T-10 four-speed that year; however, the New Process A-833 four-speed transmission was developed for Chrysler soon afterward. The A-833 was built at New Process’s Syracuse, New York, plant and rolled out in the 1964 models. Its production continued until the mid-1980s. All early versions of the A-833 were made with a cast-iron case. Aluminum-cased units were used on the A-833 overdrive version, which began in 1975. Because the cast-iron units were much more rugged, these are the most sought-after replacements for four-speed transmission conversions.

                The A-833 was reconfigured as an overdrive transmission using an aluminum case in 1975 and was used in Chrysler cars and trucks for added fuel economy. The overdrive version of the transmission reduced the third gear ratio to .73:1 to be used as the overdrive, and the 1:1 fourth gear became third.

                The overdrive configuration with a 23-spline input appeared in these vehicles:
                • 1975 to 1979 Valiant, Duster, Dart, Scamp, Swinger, Volare and Aspen (3.09:1 ratio first gear)
                • 1975 to 1987 Dodge light-duty pickups and Dodge and Plymouth vans (3.09:1 ratio first gear)
                • 1977 to 1979 Diplomat and LeBaron (3.09:1 ratio first gear)
                 
              • Daves69

                Daves69 FABO Gold Member FABO Gold Member

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                From Brewer's...…..
                Extension housing casting number C-99126 for 1969-71 A-body transmissions with 30 spline output/307 bearing. Baked and shot blasted.
                 
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                • toolmanmike

                  toolmanmike FABO Staff Staff Member FABO Gold Member

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                  We are here to educate!
                   
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