1. SGBARRACUDA

    SGBARRACUDA ROY FABO Gold Member

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    Just picked up a 7 1/4” with a Dana clutch sure grip. Strange thing is it has a 3.90 ring and pinion. Was this very common?
     
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    • Garrett Ellison

      Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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    • RustyRatRod

      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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      Crapped if I know. Is it big or small bolt pattern?
       
      Last edited by a moderator: Jun 11, 2021
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      • Kern Dog

        Kern Dog FABO Gold Member FABO Gold Member

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        I’d say it is rare. I’ve never seen that ratio in that size axle.
         
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        • valiantwagonguy

          valiantwagonguy Well-Known Member

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          It was an option in the towing package
           
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          • MOPAROFFICIAL

            MOPAROFFICIAL Well-Known Member

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            Usually 3.55 gears on the 7 1/4 sure grip package in 63-65. I had a set. They also had funky bolts... they shouldered to the carrier holes and then to a smaller thread size than say a 1971 ring would have.
            National drivetrain sold 3.91 for them.
             
          • SGBARRACUDA

            SGBARRACUDA ROY FABO Gold Member

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            These gears are marked 39-10. I did count the ring gear it was 39.
             
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            • SGBARRACUDA

              SGBARRACUDA ROY FABO Gold Member

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              A picture.

              E11B7448-1126-4CEF-89E8-59FB144E08A2.jpeg
               
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              • Kern Dog

                Kern Dog FABO Gold Member FABO Gold Member

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                That has to be aftermarket.
                Interesting piece though. I suspect that the SG would increase the durability of it
                 
              • yellow rose

                yellow rose Overnight Sensation FABO Gold Member

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                • RustyRatRod

                  RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                  The Dana Power Lock was an option for the 7.25. That doesn't look 50 plus years old though, does it?
                   
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                  • valiantwagonguy

                    valiantwagonguy Well-Known Member

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                    Well,I don't know about that,never opened one up. They were so abundant and cheap I just replaced them when I had a problem.I do know from the sales lit I have collected that they came with 323,355,and 390 ratios and offered as an option on any A body in the mid 60's .They were also part of the towing package that the wagons had and were more than likely offered in other models as well. And back in the day we as consumers could pretty much order anything we wanted from the dealer unlike today's take what we have on the lot mentality
                     
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