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Short bevel gear ratio for the Tr7

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Hi everyone, my dad owns a triumph tr7 from 1977 that wants to prepare for racing. He wants to change the crownwheel and the pinion to make the gears shorter but I couldn't find anything that wasn't too expensive. Can someone give me a link for a bevel gear of 4.2:1 ratio in sale or, if you know, is the rear differntial of the tr6 the same as the tr7?

Thank you for the attention and the help I really appriciate it

(Sorry for any mistake in my english but i'm 15 and I'm italian so...)

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