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1850 single rail overdrive mounting bracket to box bolts size/thread?

Posted: Mon May 06, 2024 4:53 pm
by cliftyhanger
Sorry for being vague.
I am away from a gearbox but wondering if anybody knows the bolt sizes fro the overdrive mounting bracket to the overdrive. I suspect 3/8 UNC, but length would be useful. And they could be 5/16!
Ta