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  • J Type Transmission Questions

    So I had my transmission rebuilt about a year ago and added the J Type overdrive at the same time. Fantastic improvement! However, I do have a leak at what appears to be the rear oil seal. It’s not dripping onto the driveway but instead slinging the oil onto the tranny cover. It then runs down the sides of the cover and slips under the cover gasket onto the interior floor (see pic). I confirmed by removing the cover. Since I had the cover off, I figured I would check the gear oil level assuming it would be low. When I removed the fill plug and with the car on level ground and the tranny warm from a recent drive, quite a bit of gear oil started streaming out so I put the plug back in. I’ll guess it was at least 3/4 of a quart over filled. Could that have created too much internal pressure causing the gear oil to exit at the area of least resistance, e.g. the rear oil seal?? Also, the flush shows quite a bit of metal looking graphite in the oil and bits on the magnetic drain plug too. Should this be a concern or normal for a rebuild with about 1,500 miles on it? Lastly, now that I need to buy to new gear oil, what would be a good replacement. I know it was filled with NAPA Oil 75-115 from Quantum Mechanics after the rebuild but isn’t there another brand that works better?




    Thanks for any help!
    1972. J Type Overdrive
    Fan Eliminator. PB Carbs
    RG Hubs. Poly Bushings
    RG Trailing Arm Brackets. Fidanza 9Ib Flywheel
    Addco Rear Sway Bar. Gear Reduction Starter

  • #2
    When Phil was here from Ca for the Mitty, we noticed that the overdrives that he biilt me were leaking through the splines of the output shaft. Disconnect your driveshaft and see if it is wet in there. Mine were. The seal was working fine. That looks like a lot of shavings for freshly rebuilt gearbox.

    Comment


    • #3
      Thanks Damson. Not sure mines leaking the same as yours since my leak is more forward of the driveshaft. See picture. Does that make sense? Could gear oil Make its way out the speedometer attachment?

      Anyone know of a better gearbox gear oil? I know one has been talked about but I can’t find the thread.

      Thanks. Kevin

      1972. J Type Overdrive
      Fan Eliminator. PB Carbs
      RG Hubs. Poly Bushings
      RG Trailing Arm Brackets. Fidanza 9Ib Flywheel
      Addco Rear Sway Bar. Gear Reduction Starter

      Comment


      • #4
        Kevin, did I understand that your gearbox was filled with something other than 30wt ND motor oil...by Quantum ? Or was that you that filled it ?
        Driving a 1973 TR6
        Doing ZS carb repairs
        email kencorsaw"at"aol.com

        Comment


        • #5
          Hi Ken. Quantum was the last one in there. I asked John what he used back when I picked up the tranny that is what he wrote in an email to me...NAPA Oil 75-115. I hadn’t even thought to look up the product until now. Holy crap, motor oil. I’ll have to question that.

          I think I found the gear oil that has been recommended on this site. Red Line MT-90 GL4 All Synthetic. Does that sound right?
          1972. J Type Overdrive
          Fan Eliminator. PB Carbs
          RG Hubs. Poly Bushings
          RG Trailing Arm Brackets. Fidanza 9Ib Flywheel
          Addco Rear Sway Bar. Gear Reduction Starter

          Comment


          • #6
            Redline MT-90 is what I've been using, Kevin.
            I think people will be surprised at John recommending anything but 30 wt non-detergent(ND) motor oil...you sure that email was from John Esposito ???
            Last edited by poolboy; 06-09-2019, 08:07 PM.
            Driving a 1973 TR6
            Doing ZS carb repairs
            email kencorsaw"at"aol.com

            Comment


            • #7
              Ken, below is a copy from the email...

              We use the standard NAPA oil part number 75-115.

              This is an Ashland product which is the same as Valvoline and some other
              brand products.

              Let me know if you need any more info.

              John
              1972. J Type Overdrive
              Fan Eliminator. PB Carbs
              RG Hubs. Poly Bushings
              RG Trailing Arm Brackets. Fidanza 9Ib Flywheel
              Addco Rear Sway Bar. Gear Reduction Starter

              Comment


              • #8
                OK I get it now, Kevin..that's the part number for the NAPA motor oil...not the viscosity of a NAPA gear oil....got it.
                I'm still going to be using MT-90
                Driving a 1973 TR6
                Doing ZS carb repairs
                email kencorsaw"at"aol.com

                Comment


                • #9
                  Gotcha, but still surprising, at least to me, that it is motor oil. I’ll be putting the MT-90 in as well Ken.
                  1972. J Type Overdrive
                  Fan Eliminator. PB Carbs
                  RG Hubs. Poly Bushings
                  RG Trailing Arm Brackets. Fidanza 9Ib Flywheel
                  Addco Rear Sway Bar. Gear Reduction Starter

                  Comment


                  • #10
                    John has always recommended 30 wt non-detergent since Ive owned my TR6 (12 years) and he used to have an article on his website explaining why and the damage he had seen from other fluids. That’s what I put in mine 10 years ago and so far so good but hey, it’s your car so do what you think is right. I have heard the MT-90 finds every little leak that you didn’t know you had.
                    Last edited by lfmTR4; 06-09-2019, 09:15 PM.
                    I72 Pimento w/overdrive

                    Comment


                    • #11
                      The transmission oil leaks in the TR6 can be tricky as we see the results (oil drip or pool) and think its a direct path to that spot but it rarely seems to be the case. There are a couple of thru bolts that should have copper washers on them to prevent leaking (at the top of your pic almost in it but just out of sight), the angle drive does have an o-ring in it so maybe, it could also be your top cover either leaking where it attaches to the gearbox or from leaking o-rings from the rear of the levers. As mentioned above, Phil also told me the splines can also leak so when I did my recent rebuild I sealed them as well. Surprised that its leaking already after such a fresh rebuild. Lots of good non-silicon sealants out there that really work well (Hylamar for my tastes) that work with gaskets and that will also seal the splines.
                      Weird idea for you.....assuming you've wiped things down with a paper towel or something....drive it around a bit to get things flowing again and then puff some flour around and let it sit. It will absorb the oil along its path and you'll be able to trace it that way. Short of using dye its all I can recommend.

                      Comment


                      • #12
                        Thanks all for the responses. I have heard of the flour or baby powder trick but have never tried it. May be now would be a good time. Right now I’m on hold until I get some gear oil. This Red Line stuff is not widely carried here in Conn. May have to order online.
                        1972. J Type Overdrive
                        Fan Eliminator. PB Carbs
                        RG Hubs. Poly Bushings
                        RG Trailing Arm Brackets. Fidanza 9Ib Flywheel
                        Addco Rear Sway Bar. Gear Reduction Starter

                        Comment


                        • #13
                          Valvoline MTL is a synthetic blend that I'm running in the J-type now and it works fine - easier to find and about half the cost. Redline is nice stuff too. I put the Valvoline in as a stopgap as my machine shop sells the Redline but they were closed on the Sunday I needed it. Haven't felt the need to swap it.

                          Comment


                          • #14
                            Thanks Yankee5! Ironically, I found the Red Line at a speed shop I never knew about and was only 10 minutes from my house! I also did some research on the Buckeye site that mentions several different fluids and the Red Line is there as well as the Valvoline.

                            Now I have a stupid question, do I need to drain the overdrive unit separate from the main gear box or can just drain the gear box? I’ve never done an overdrive equipped tranny fluid change before now.

                            Thank you.
                            1972. J Type Overdrive
                            Fan Eliminator. PB Carbs
                            RG Hubs. Poly Bushings
                            RG Trailing Arm Brackets. Fidanza 9Ib Flywheel
                            Addco Rear Sway Bar. Gear Reduction Starter

                            Comment


                            • #15
                              Both drain out the same drain plug hole....fill it as directed, but check the level again after your first drive. I've always found it necessary to add more.
                              I think the 'oil' needs circulation to get everywhere it needs to go which leaves room for more.
                              Keep in mind even though you drain out the old oil, it's going to take some use for the new oil to wash off and replace the old oil off of the surfaces of the components..
                              In other words, don't expect to notice an immediate (if any) difference...
                              Last edited by poolboy; 06-12-2019, 07:26 PM.
                              Driving a 1973 TR6
                              Doing ZS carb repairs
                              email kencorsaw"at"aol.com

                              Comment

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