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    Another diff question....

    So I went to refit the diff cover with its new gasket and found the gasket was not going to fit.....on confirming i had definitely ordered the correct gasket, it turns out my diff is not a stag diff....

    The backplate has part number 305721, am I right in thinking thats from a TR4 IRS diff?

    Presumably the stag diff is uprated compared to that of the tr4, am I better off finding a stag diff or will refitting the tr4 one be ok bearing in mind its quiet and nothing wrong with it aside from its incontinence???

    thanks
    Kevin
    1967 Vauxhall Victor
    1973 Stag

    #2
    Stag is deeper underneath crownwheel tooth root.
    Stag has a different bolting pattern for the cover.
    Tr4 had a 3.7:1 ratio ; stag had a 3.7:1 diff ratio.
    AFAIAA there will be 2 bolts that don’t fit.
    The upper one cannot be redrilled.
    The lower one can be redrilled & tapped 5/16 unf.
    Last edited by jbuckl; 25 November 2021, 01:12.
    There are 2 secrets to staying on top :- 1. Don't give everything away.
    2.

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      #3
      Mystery solved I think, it appears to be a 3.45 diff and backplate from a triumph 2.5pi estate, going by the 'MG' code I found under several layers of paint and accumulated grunge. Turning the output shaft twice gives me a bit less than 3 and a half turns on the input.

      Pondering now whether to go back to a 3.7......
      1967 Vauxhall Victor
      1973 Stag

      Comment


        #4
        Kevin.
        I reckon the 3.45 is a much better ratio for an automatic if you have one, giving a worthwhile reduction in revs and fuel consumption. However, it is a bit high for a manual with o/d, and will mean switching the o/d out earlier on long gradients.
        At least that is what I think, having tried both..
        Mike.

        Comment


          #5
          I have a 3.45 behind my OD Stag. I used an Estate rear cover as I wanted to keep the 3.7 complete in case I wanted to change back, I don't and yes I wouldn't want it any higher geared and cruises nicely at 2375 revs @ 100k and with the odd extra gear change, given my hoon days are over, well just about.
          Cheers Ian A

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