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TR2/3/3A TR3A Gearbox fluid capacity question

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bohuntr

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I have what appears to be a stock gearbox on my TR3A. No dipstick. I read that capacity is 1.8 pints. It has a square plug in the bottom for drainage and a square plug in the side for filling. In addition to the 1.8 pint capacity, I have read that you should just fill it until it comes out the fill hole. I have added the 1.8 pints and it is still well below the fill hole. I would guess it would take another have pint minimum to get it to that level. So..... Do I stick with the 1.8 pints or fill it until it comes out the fill hole?

Thanks

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