Not necessary
I don't think the six pin driver and fine splines are necessary at all! I would agree with a red spring but I think your spending money that doesn't need to be spent. Been pulling a 104 for three years now with a red spring and a 10% overdrive and doing real well. Governor get your governor set right and you will do well! Most people don't know how to set a governor at all for pulling! My two cents! 
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104 puller, 1200 puller, 1450 toy!
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