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Swopping gearbox from a-type to J-type

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    Swopping gearbox from a-type to J-type

    hi, I have a mk1 stag which has an a-type overdrive, which is past its best, I have seen advertised a reconditioned gearbox with J-type overdrive, my question is will it fit in to my car? Im pretty sure the gearbox will (is there a difference??) but will the overdrive fit and work? Or should I just get my current setup reconditioned??

    any advice appreciated.

    #2
    It should just bolt on

    Comment


      #3
      Thanks for the reply. Are the electrical connections the same?

      Comment


        #4
        Prop shaft will be different
        Mabel is a white 1972 Mk1, TV8, ZF 4HP-22 auto,
        2016 RBRR finisher. 400 mile C2C 21/22 April 2018!

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          #5
          I think the propshafts are the same, however the mountings are different looking at Rimmers website, and the bits are not cheap

          Neil
          TV8, efi, fast road cams and home built manifolds. 246bhp 220lbft torque

          Comment


            #6
            The rear gearbox mounting bracket is different ,propshaft is the same,electrical connections are the same,different solenoid but that should come with gearbox

            Dave
            Last edited by new to this; 14th June 2019, 21:28.
            73 mk 1/2 now gone to the dark side BLUE

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              #7
              is it actually reconditioned (rather than gunked off and painted) and if so by someone who knows what they are doing?

              What is wrong with the current a-type setup?

              Richard
              Stags and Range Rover Classics - I must be a loony

              Comment


                #8
                Why is that? The length or the flange? Could I use the gearbox flange from the type a if it was the flange size?

                Comment


                  #9
                  Sorry I missed a few replies. The gearbox has been properly rebuilt so I’m told. The problem with the current gearbox is that it is difficult to engage some gears especially reverse, the overdrive does not work because I think there is a plate missing off if the side just by the solenoid, under it you can see the parts that move in and out, I have no idea where the cover plate is as I brought the car as a restoration, I’ve only just noticed it is not there whilst looking at the type of overdrive fitted. I don’t really want to go to too much expense on trying to get the gearbox to fit, I may be cheaper in the long run to get a type A reconditioned unit?

                  Comment


                    #10
                    A type overdrives are worth lots in the TR market where they are now getting to be unobtainable, You might have turned your back on it but there is gold in them thar hills.

                    Alan

                    Comment


                      #11
                      Originally posted by Gholmes View Post
                      Why is that? The length or the flange? Could I use the gearbox flange from the type a if it was the flange size?
                      The flanges on both gearboxes are the same, as I said your need to chance the gearbox mounting bracket that holds the rear of gearbox to the car

                      Dave
                      73 mk 1/2 now gone to the dark side BLUE

                      Comment


                        #12
                        Your old gearbox whatever condition is still worth 500 to the trade
                        Stag Owners Club Forum has registered Tonywhite as a Trader in used parts for The Triumph Stag. 13.12.2017

                        Comment


                          #13
                          Dont forget the exhaust down pipes, j type are listed as different, I think they drop or maybe curve more than the Atype/non OD one.

                          Terry
                          Terry Hunt, Wilmington Delaware

                          www.terryhunt.co.uk

                          Comment


                            #14
                            Originally posted by Gholmes View Post
                            Sorry I missed a few replies. The gearbox has been properly rebuilt so I’m told. The problem with the current gearbox is that it is difficult to engage some gears especially reverse, the overdrive does not work because I think there is a plate missing off if the side just by the solenoid, under it you can see the parts that move in and out, I have no idea where the cover plate is as I brought the car as a restoration, I’ve only just noticed it is not there whilst looking at the type of overdrive fitted. I don’t really want to go to too much expense on trying to get the gearbox to fit, I may be cheaper in the long run to get a type A reconditioned unit?
                            Sounds like your clutch is dragging if you are having difficulty engaging gears.
                            Make sure the system is properly bled which cannot be done with the slave cylinder bolted in place. You need to remove the mounting bolts and twist the cylinder so the bleed screw is on the top before bleeding then re-fixing.
                            The missing plate is just a cover. Make sure the operating lever on the overdrive is making its full travel, it is covered in the Haynes manual.

                            I have had problems with A type solenoids in the past where the internal electrical contacts have corroded. The solenoid has a pull in coil and a holding coil. The contacts provide the current for the pull in coil and if dirty the mechanism will not move the linkage far enough to engage the overdrive. Remove the end cap from the solenoid and clean up the contact points.

                            This lot will take a couple of hours and cost nothing and may solve your problems.

                            Neil
                            Neil
                            TV8, efi, fast road cams and home built manifolds. 246bhp 220lbft torque

                            Comment


                              #15

                              I would stick with your A type rather than risk an unknown item that may be no better than your own. If you have concerns then discuss with overdrive services in Sheffield ( I have no connection) but they are an honest company and do excellent work and are happy to talk over your problem on the phone.

                              https://www.overdrive-repairs.co.uk/

                              Be wary of exchanging your box A to J without being aware just how much an A box and overdrive is worth, far more than a J box & overdrive.

                              Alan
                              Last edited by barkerwilliams; 15th June 2019, 07:34.

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