1. FJRdoc

    FJRdoc FABO Gold Member FABO Gold Member

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    I have been battling a leaky 727 pan for about a year. I tried multiple gaskets and finally purchased the Mopar reusable gasket. Unfortunately, the pan still dripped from the front left corner. I also had a leak from the speedo pinion shaft.
    I decided that this was the weekend that I was going to make the tranny drip free. I took out the speedo carrier and pinion ad made a trip to the local transmission shop. They had a seal that fit and has a spring around the lip to give a better fit.
    I removed the tranny pan and meticulously cleaned all surfaces on the pan and tranny. The lip of the pan was flat and showed no signs of overtorqueing. I have a tube of Hylomar Blue which I have used in the past. I applied a thin coating to all surfaces and let it tack up. Bolted everything back together and torqued to 100 inch pounds. Finally, no more red fluid on the garage floor!
     
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    • 512Stroker

      512Stroker We are all here because we are not all there.

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      The pan will leak just give it time. Sorry
       
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      • FJRdoc

        FJRdoc FABO Gold Member FABO Gold Member

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        Way to burst my bubble Stroker.
         
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        • 512Stroker

          512Stroker We are all here because we are not all there.

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          I recently had a really bad time with a 727 pan I tried all the tricks and the bastard still seeped.
          I fixed it so it never bothers anyone again.

          P1.jpg

          P3.jpg
           
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          • FJRdoc

            FJRdoc FABO Gold Member FABO Gold Member

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            I guess you could say that pan was not bullet proof.
             
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            • 74 360 dart sport

              74 360 dart sport Well-Known Member

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              A friend of mine owns a transmission shop showed me a trick back in the 80's with the bottom side of the pan down take a ball peen hammer put the edge of the pan on the end of your bench or vise tap every hole back out it creates a better seal when tightening the bolts back up
               
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              • Mopar44134

                Mopar44134 Well-Known Member

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                Thats funny.

                By the way...anyone try the speedmaster tranny pans?
                 
              • j par

                j par Well-hung Member

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                I also do that with oil pans..
                 
              • ocdart

                ocdart Inland Mopars Car Club FABO Gold Member

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                • Jim Kueneman

                  Jim Kueneman FABO Gold Member FABO Gold Member

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                  I have read Hylomar is suppose to be the ultimate but it very expensive. Nice to know it was not just hype. Thanks. I have a 904 that I am struggling with, may have to give that a try.
                   
                • RBConvert

                  RBConvert Well-Known Member

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                  A couple years ago I installed a B&M deep sump pan with the Moroso "blue" gasket on the Coronet. No leaks yet. The OEM pan wasn't leaking either, but I wanted the additional capacity and the B&M comes with a sending unit.
                   
                • pishta

                  pishta I know I'm right....

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                • FJRdoc

                  FJRdoc FABO Gold Member FABO Gold Member

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                  A little Hylomar goes a long way. Spread a small bead and then smear it out with your finger. Let it sit for about 10 min. to let the solvents evaporate and bolt together.
                   
                • missing linc

                  missing linc Loose nut behind the wheel

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                  Had that problem with a 904 pan in my first Dart, friend of mine owned a trans shop, and I had him do a service on it. He tossed the original pan in the parts washer and put a different one back on. Well it leaked and leaked, and leaked more. I took it back to him 3 or 4 times, but it just kept leaking. Finally he got fed up and put a different pan on, no more leaking. We took the leaky pan and beat it to death with a sledgehammer and then cut it up with an air chisel. I had exceptionally clean transmission fluid after that!
                   
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                  • ocdart

                    ocdart Inland Mopars Car Club FABO Gold Member

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                    • j par

                      j par Well-hung Member

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                      Don't forget the selector seal can look like a pan leak...
                       
                    • moparmat2000

                      moparmat2000 FABO Gold Member FABO Gold Member

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                      Not only bullet proof, it wasnt billet proof either. That finned aluminum pan looks sexy..
                       
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                      • MoparMike1974

                        MoparMike1974 FABO Gold Member FABO Gold Member

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                        ...and in most cases is the culprit. Another is the KD pin at the tailshaft gasket surface. I fill that with silicon and no leaks.
                         
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                        • FJRdoc

                          FJRdoc FABO Gold Member FABO Gold Member

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                          I checked every other potential source of transmission leak and found nothing. The selector seal and dipstick tube were all dry.
                           
                        • pishta

                          pishta I know I'm right....

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                          I had one leaking out the kickdown lever pin. (iirc its exposed on passenger rear of case) a blob of RTV finally fixed it. I didnt think the ATF went that high but it was all over the place after a drive and must have just settled and dripped off the lowest point, the pan corner.
                          @MoparMike1974 beat me to it.
                           
                        • MoparMike1974

                          MoparMike1974 FABO Gold Member FABO Gold Member

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                          Yes, I have seen them leak even with new o-ring in place. I just got to where I rtv it up from the get go.
                           
                        • Ricks70Duster340

                          Ricks70Duster340 Child of the King FABO Gold Member

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                          I use the same TCI pan. Love it. Have had it off several times. I just wipe off the gasket & flange & reinstall. No leaks. Expensive, but worth it to me.
                           
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                          • MOPAROFFICIAL

                            MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                            Same ,leaking 518 pan. Gaskets, moroso re usable, stock pan, derale pan...
                            Still gets wet at the front and leaks drops.

                            Irritating.
                            I used to have great luck using a little 3M adhesive between the gasket and the pan letting it set and then cleaning with some alcohol on a rag the edge of the transmission surface and then just bolt it together with a 1/4 drive.
                            Might just try that again.
                             
                          • RustyRatRod

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

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                            Put a 4 speed in it.
                             
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                            • Ricks70Duster340

                              Ricks70Duster340 Child of the King FABO Gold Member

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                              Now Rob.... !
                               
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