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Me again ! This is a simple question .. Should the Layshaft 3rd gear be 20T or 21T on a standard Dommi AMC box ? Mine has a 21T whilst everything else i`ve read or seen says it should be 20T. ( The Main shaft it runs with is 21T ) ? It seems to mesh ok but I have never tried this box as it was built by someone else .
Wayne, - a standard Dommie,…
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Hi Howard , my Mainshaft top…
Hi Howard , my Mainshaft top gear (4th ) has 24T so that makes it an AMC1 . My Layshaft third gear is indeed a 21T and matches with a 21T Mainshaft . So it looks like whoever did the conversion did it right . As far as I can see, the cogs mesh together ok although I have no idea of the teeth angles . I wonder what this conversion actually achieves ? Cheers for the invaluable info. .
Wayne .
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Wayne, - a standard Dommie, which would have had the AMC1 ratios from new , will have a 20T Layshaft third gear. If yours has a 21T Layshaft third gear then whoever did the conversion to this gear should have also changed the Mainshaft third gear appropriately. This will have 21T but with slightly different teeth angles from the original AMC1 cog. So does you box have a 23T or 24T mainshaft top gear? (23 T= AMC2 : 24T = AMC1) All NA prefix gearboxes and post 62 boxes have AMC2 gearing from new. Cheers, Howard