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  • stag8manod
    replied
    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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  • Lingen
    replied
    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.

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  • Stag-Victor
    replied
    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......

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  • jbuckl
    replied
    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.

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  • Stag-Victor
    started a topic Another diff question....

    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
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