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    Intro and Diff supplier

    Hi All,
    First Post.. Bought a 1972 Stag last weekend and picking it up this weekend. Have been working on Triumph cars for a fair time. Currently have a TR6 (supercharged) and a 2500TC saloon both of which succesffully completed the RBRR earlier in the month!
    Anyhow, my test drive of the car (which was generally good) showed up a whiney Diff. Not terrible, but would probably want to change it over the winter. Looks like the front seal of the diff is also probably leaking as there is a nice line of grease from from the diff nose on the underside of the car.. So looks like a rebuild..
    So my questions are: 1) where to get a diff from.. Who are trusted suppliers of whine-free diffs? 2) Being more used to the TR setup, should I remove and refurb just the diff our should I also remove the nose housing and quill shaft and change these bearings. If the latter, can I do this without removing the whole rear subframe? I have a hydraulic lift so access isn't too much of an issue.. Also, what is the story with strengthening the quill shaft housing..
    Thank for any help
    Cheers
    Tim
    '72 Triumph TR6 Supercharged; '72 Triumph Spitfire 1300; '72 Triumph Stag

    #2
    Quill shaft bearings are easy to do , just drop the exhaust a bit, replace the gaskets and check this post...

    Does anyone who has strengthened their diff nose have a template and a recommendation on how thick the plates should be, and ideal location on nose where to
    Last edited by singapore stag; 28 October 2021, 10:26.

    Comment


      #3
      The quill shaft extension housing has been known to fail on quite a few cars, and when it does it is fairly catastrophic. Strengthened items are avaialable from the usual suppliers, or if you are handy with a welder, you could do it yourself (careful with heat distortion though).

      A good "sleep well at night" modification IMHO, and if you are having the diff out anyway, a no-brainer. Lots of good threads on here about it.

      PS - talk with Peter at LD Parts about the quality of the quill shaft bearing - you need a good one, and he sells them IIRC.

      Sorry, can't help with your main diff supplier question. Welcome to the club.
      Last edited by wilf; 28 October 2021, 18:06.
      Header tanks - you can't beat a bit of bling.

      Comment


        #4
        For replacements diffs, this company comes up often on this formum. http://www.tdfitchett.co.uk/ .

        Comment


          #5
          The nice thing about strengthening the quill shaft housing, is the ability to lift the rear of the car by the diff. Without strengthening it, lifting from this point has discouraged.
          Sujit

          Comment


            #6
            Originally posted by sujitroy View Post
            The nice thing about strengthening the quill shaft housing, is the ability to lift the rear of the car by the diff. Without strengthening it, lifting from this point has discouraged.
            Sujit
            is it?
            Stags and Range Rover Classics - I must be a loony

            Comment


              #7
              Hi, If you are going to change, overhaul your diff, certainly strengthen the nose. There is only one bearing in there, easy to do, use an SKF one, twice the price of some of the others but worth doing. Your diff will be a 3.7. While you're at it how about putting in a 3.45 diff from an S saloon, drops the cruising revs with a little loss of acceleration. You will need a diff cover from any Estate or a Mk1 saloon because Triumph changed it on the Mk2 saloons. My OD Stag does 2450 revs @ 100k on a 3.45. Drill a small hole in the underside of the extension tube as a telltale for a leaking pinion seal and it also stops the leak washing the lube out of the extension bearing.
              Cheers Ian A
              Last edited by stag8manod; 28 October 2021, 18:59. Reason: forgot to sign off

              Comment


                #8
                Thanks everyone. That is very helpful!
                '72 Triumph TR6 Supercharged; '72 Triumph Spitfire 1300; '72 Triumph Stag

                Comment


                  #9
                  Hi Tim

                  Welcome to the madhouse! When you mentioned on the RBRR that you were thinking of getting a Stag, I didn't realise you meant so quickly

                  Definitely swap it for a 3.45. You will want that for the 2023 RBRR

                  Regards

                  Bruce
                  1973 GT6 Mk3 Pimento Red
                  1974 Stag MOD,3.45 diff,French Blue, Fiat seats, Belt EWP, H/Tank

                  Comment


                    #10
                    Originally posted by Rubce View Post
                    Definitely swap it for a 3.45. You will want that for the 2023 RBRR
                    And check the rear hubs too - you don’t want one of those failing on the RBRR. My co-driver hasn’t spoken to me since……
                    Richard
                    Mabel is a white 1972 Mk1½, TV8, Mo/d.

                    Comment


                      #11
                      Originally posted by mole42 View Post

                      And check the rear hubs too - you don’t want one of those failing on the RBRR. My co-driver hasn’t spoken to me since……
                      Or just carry a spare driveshaft with you on a big event
                      1973 GT6 Mk3 Pimento Red
                      1974 Stag MOD,3.45 diff,French Blue, Fiat seats, Belt EWP, H/Tank

                      Comment


                        #12
                        Bruce, Great to hear from you. Sorry again about our super bright LEDS. Did you manage to mend the damage caused by the maniac who drove us both off the road?
                        Very aware of rear hubs. My TR6 has a supercharger (see picture) and does nasty things to drive shafts and rear hubs on alpine passes. Now running a CV jointed rear end.
                        tim
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                        '72 Triumph TR6 Supercharged; '72 Triumph Spitfire 1300; '72 Triumph Stag

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                          #13
                          Picked up the car today. Drove well appart from the diff whine
                          You do not have permission to view this gallery.
                          This gallery has 1 photos.
                          '72 Triumph TR6 Supercharged; '72 Triumph Spitfire 1300; '72 Triumph Stag

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                            #14
                            Excellent news Tim
                            1973 GT6 Mk3 Pimento Red
                            1974 Stag MOD,3.45 diff,French Blue, Fiat seats, Belt EWP, H/Tank

                            Comment


                              #15
                              Hi Tim

                              With regards to the off road damage I have reduced the noise but its still there. I will take the front suspension and brakes apart and investigate further when I have time. No immediate rush as it also requires 4 new tyres and the tracking adjusting before it goes out on the public road again. Its having a well earned rest after a busy year and our GT6 is currently out and about on driving duty.

                              Regards

                              Bruce
                              1973 GT6 Mk3 Pimento Red
                              1974 Stag MOD,3.45 diff,French Blue, Fiat seats, Belt EWP, H/Tank

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