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series 40 & 60 ring & pinion

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we are new forum users,i'm not sure where to post this.

we are rebuilding (in the UK) a 1937 40 series 2dr coupe for the Peking to Paris Rally in May this year, we have 40 series ring & pinion (4.4:1 ratio) which is very worn, but would like to raise the gearing so looking in the Shop Manual the ring & pinion for a 60 series (3.9:1) lookjs as though it would fit, having contacting Bobs Automobilia & found they are not obtainable, he thinks a later model may fit but is not sure if & what later models will fit.

Does any one know if & what later models of 3.9:1 ratio 60 series will fit our 40 series

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