1. limegreen70

    limegreen70 Pokorny Enterprise's

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    What Tooth Speedo gear do I need for a 3:91 rear, 26'' tall tire car?
     
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  2. Professor Fate

    Professor Fate Push the button, Max...

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    • limegreen70

      limegreen70 Pokorny Enterprise's

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    • limegreen70

      limegreen70 Pokorny Enterprise's

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      Quick question. What size wrench does the nut take that takes the speedo cable off the 727? Looks like it might be a 15/16. Biggest wrench i have is a 7/8.
       
    • Ricks70Duster340

      Ricks70Duster340 Child of the King, widower FABO Gold Member

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      Believe it is a 1". I use a large adjustable wrench on mine.
       
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      • toolmanmike

        toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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        Now is when I miss the tool truck in the driveway. I had a set of stubby wrenches that work great for this kind of stuff.
         
      • Ricks70Duster340

        Ricks70Duster340 Child of the King, widower FABO Gold Member

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        Tool trucks are evil because they always cause us to see another tool that would be great for this or that! That's why when we are older we look at our array of tools and wonder how we ever did that!!!
         
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        • toolmanmike

          toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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          Exactly, by design. It was a fun ride for almost 30 years.
           
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          • limegreen70

            limegreen70 Pokorny Enterprise's

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            It never occured about a stubby wrench! I tried a crescent and channel locks. Both are to big and hit the crossmemeber.
             
          • TrailBeast

            TrailBeast AKA Mopars4us on Youtube

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            If you only tighten that nut by hand you will never have that problem.
            There is zero reason it needs to be wrench tight.
             
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            • limegreen70

              limegreen70 Pokorny Enterprise's

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              I wasn't the one who installed it so it is wrench tight. I notice rtv around that area so I think that is where my 727 leak is coming from and while I am at it, I figured I put the proper speedo gear in it to.
               
            • Ricks70Duster340

              Ricks70Duster340 Child of the King, widower FABO Gold Member

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              Mine leaked too. It is likely the speedo gear pinion seal. I got a new o-ring for the speedo housing & smaller black seal for the speedo pinion from ebay. Fixed my problem.
               
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              • TrailBeast

                TrailBeast AKA Mopars4us on Youtube

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                Gotcha.
                I use just a thin film of rtv where the large O ring around the housing contacts the trans case.
                It’s not enough to see from the outside.
                Hopefully who did yours was just a little rtv happy and there isn’t some issue they were trying to fix.
                 
              • TrailBeast

                TrailBeast AKA Mopars4us on Youtube

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                You can even put 2 of those small seals in there.
                It fixes a speedo gear shaft groove problem.
                 
              • Ricks70Duster340

                Ricks70Duster340 Child of the King, widower FABO Gold Member

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                I've seen leaks where whoever put in the pinion seal did not fit it all the way into the recessed area before putting the metal retaining clip on. When they pushed the speedo gear in, it shifted the seal and a leak occurred. I've never had to use RTV to cover a seal leak on the housing. Simply put on fresh seals & applied a little dielectric grease (vaseline would work too) to the seal & pinion shaft. When inserting the gear into the housing, slowly insert it while turning it to keep the seal from moving out of place.
                 
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                • limegreen70

                  limegreen70 Pokorny Enterprise's

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                  My thinking is. The seals are original and when they started to leak, rtv was just put around the outside instead of changing the seals. I could be wrong though, we shall see. I Just hope like hell it stops the majority of the leaks. I am so sick of atf everywhere.
                   
                • Ricks70Duster340

                  Ricks70Duster340 Child of the King, widower FABO Gold Member

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                  Yeah, getting our older cars to stop leaking is an ongoing problem! When I got my car this past November, I found the gas tank leaked when I filled it full. When I got it home, I found the old owner put RTV type stuff all around the filler tank grommet to try to stop the leak. Guess it was too much work to simply change the grommet! I pulled the grommet, scraped all the "pookie" off around the tank opening, and installed a new grommet. Lubed the filler tube and reinstalled it. No more leaks. Funny!
                   
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                  • toolmanmike

                    toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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                    :lol: New/soft rubber seals and fresh gaskets can do wonders.
                     
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                    • limegreen70

                      limegreen70 Pokorny Enterprise's

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                      people are lazy. But I understand that some people dont have the physical ability or even the cash to do a proper fix so they jerry rig it. But I cant have bad work on my conscious so I always try and do the job right.
                       
                    • Ricks70Duster340

                      Ricks70Duster340 Child of the King, widower FABO Gold Member

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                      Amen!
                       
                    • TrailBeast

                      TrailBeast AKA Mopars4us on Youtube

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                      I hear ya on the leaks, they annoy me too.
                      Who knows though, as they could have tried to fix it and trashed the gear from not putting it back together with housing in the correct orientation.
                      Maybe just smearing rtv on it was a blessing.:D
                       
                    • limegreen70

                      limegreen70 Pokorny Enterprise's

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                      So the gear I have is a 41 but I need a 40. Does a extra tooth make that much of a difference in mph?
                       
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