Does anyone know if I buy this kit http://www.ebay.com/itm/Traxxas-3978...#ht_1628wt_813 1. Will it work in the stock tmaxx 3.3 Diferential without modification? 2. Besides the input pinion on the stock emaxx diff being shorter, is the spider gear braces the only reason why the emaxx brushless diffs are so much stronger or is the pinion and main diff gear made out of more HD metals?