A question about frame dimensions Dodge vs Plymouth

Exterior Body, Paint, Trim, Chrome

  1. Alwayslookin1

    Alwayslookin1 New Member

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    I'm wanting to check my frame dimensions on my 1969 Satellite and I found this pic here on the forum-Credit to Jeremiah who posted it on another thread.

    My question is can these dimensions be used for Plymouth B-bodies. The research I did told me that the wheelbases are 1 inch longer on the dodge but I couldn't find any info regarding any other differences frame dimension-wise. Thanks for any help and insight into this


    6476159-frame69coronet-jpg.jpg
     
  2. YY1

    YY1 Well-Known Member

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    I've suggested that the "one inch" might be an advertising gimmick to suggest the Dodge was a superior brand.

    Wheelbase was seen as sort of a status symbol in the 1960's.

    Others have said the front hanger for the rear spring is different.
     
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    • R413

      R413 Well-Known Member

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      Just get a Factory service manual for your exact car. It will have thousands of benefits throughout your car ownership.

      There are many more differences From Dodge/Plymouth chassis structures.
       
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      • hunt2elk

        hunt2elk FBBO Gold Member FBBO Gold Member

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        The Dodge wheelbase is 1" longer than a Plymouth 68-70. But they do it with different rear spring hangers front and rear. So the actual frame rails and floorplans are the same on both models.
         
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        • R413

          R413 Well-Known Member

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          The Dodge and Plymouth frame rails are not identical. In 1967 on 2 door hardtops a Coronet quarter panel is 4” Longer than a Belvedere/Satellite. Not counting the quarter extension. So the frame rails and trunk floors must be longer.
          The quarter extensions are different also.

          I got an original factory trunk mat From a Coronet and I had to cut it off at the rear edge as it was too long to lay flat in a Belvedere trunk.

          So get the book for your exact year and make of car or you may have the wrong dimensions.
           
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          • R413

            R413 Well-Known Member

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          • hunt2elk

            hunt2elk FBBO Gold Member FBBO Gold Member

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            Pretty sure if look above your post, I stated 68-70. I stated that because I am not familiar with 67's. So don't know where that came from and the op is asking about a 69 anyway. 68-70 frame rails ARE identical. The difference is the rear spring mount that is welded to the rail.
             
            Last edited: Feb 19, 2021
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            • dsd1967

              dsd1967 Well-Known Member

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              R413. The frame rails are the same length. Take a measurement inside the trunk for each model. I put a 69 charger trunk pan in my 67 Belvedere 4 door without trimming a thing from the pan. Hunt2elk is correct that the difference is in the front and rear leaf spring hangers
               
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              • R413

                R413 Well-Known Member

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                OK maybe some are the same, but 67 Coronet and Belvedere are different. From what I’ve personally done I see differences with them.

                Can we sit here and say all 68-70’s are the same? I would say that’s not very smart thing to tell others without verifying it.

                I’m sharing my experiences with 67’s because that’s the specific info I have. FWIW
                 
              • Alwayslookin1

                Alwayslookin1 New Member

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                Wow thanks for all the help everyone! I'm going to get a factory service manual for sure.
                 
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                • moparmarks

                  moparmarks FBBO Gold Member FBBO Gold Member

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                  I have both 66 Dodge and 66 Plymouth rear frames drilled out from the cars and they are the same. I've also had several 68-70 Plymouth and Dodge frames drilled out and sitting next to each other and they are the same. Spring hangers are different as are the trunk extensions.

                  DCP_5899.jpg DCP_7660.jpg 20190330_101252.jpg
                   
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                  • moparmarks

                    moparmarks FBBO Gold Member FBBO Gold Member

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                    I have verified this several times with the frames removed from the cars, on the ground next to each other with a tape measure. My crash parts books also verify this too. I have found this to be true for all 62-74 frames
                     
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                    • hunt2elk

                      hunt2elk FBBO Gold Member FBBO Gold Member

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                      I would say for B bodies that is a safe bet. A few years ago I replaced the rotted out rear rails of a 69 Charger with originals from a 68 Satellite. Perfect fit except I had to buy Plymouth rear spring mounts.
                       
                    • odcics2

                      odcics2 Well-Known Member

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                      Dodge Charger stock cars used a front Plymouth rear spring hanger. The rear was relocated on the rail.
                      Easy, fast way the get an “altered wheelbase” car slipped by the Nascar rule book.
                      The front k member and control arms also were moved.
                      Ingenious.
                       
                    • YY1

                      YY1 Well-Known Member

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                      Bad logic to say that because QP is longer, then frame must be longer.
                       
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                      • dsd1967

                        dsd1967 Well-Known Member

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                        Your logic is the same as saying the front frame rails are different because a charger fender is different is a different length than a Belvedere fender.

                        Chrysler gave Plymouth and dodge the same underpinnings and doors and let the designers work around them. It doesn’t surprise me the quarters are that much different and I learned something new. The fact remains the frame rails are the same with exception of the spring hanger as moparmarks points out.
                         
                      • dsd1967

                        dsd1967 Well-Known Member

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                        Oops I reread your post and you are saying the same thing as me.
                         
                      • Fm3 Dart

                        Fm3 Dart Well-Known Member

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                        68-70 Dodge and Plymouth B body underbodies are identical except for one thing: The rear shackle tube is 1 inch further back on a Dodge. This is the tube welded into the rear frame rail outrigger, that the upper shackle bushings are in. The Dodge wheelbase was 1 inch longer due to the 1 inch longer leaf spring hanger, which is a bolt on part.
                         
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                        • YY1

                          YY1 Well-Known Member

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                          Did you also use a 68-70 gas tank?

                          The 66/67 trunk floor has a spare tire well and a different gas tank that basically interlocks with the well.
                          (as well as a side fuel filler)

                          The 68-70 trunk floors are flat and have a behind the plate fill (except Charger)

                          The exception is that 68-70 wagons use the 66/67 trunk pan (and gas tank).
                          The spare tire well is used as the 3rd seat foot well in 9 passenger wagons.
                          68-70 wagons also have side fuel fill.

                          I am 95% sure the 66/67 side fuel fill and the 68-70 Charger side fuel fill are very different.
                           
                        • dsd1967

                          dsd1967 Well-Known Member

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                          I did use a 69-70 charger tank so I could use the Belvedere fuel fill. I had to make a custom filler neck.

                          Long story short. I did a mini tub and wanted the exhaust all the way out the back. The 66-67 spare tire well wouldn't permit that, so I went with the flat floor and narrower 69-70 tank and ran the exhaust between the rail and the tank.

                          IMG_0542.JPG IMG_0543.JPG IMG_0760.JPG
                           
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