...For your pinions go with AE 18T pinions or HPI MICRO...Try and get them as HARD as you can because AONS eat unwary pinions for breakfast...
...the AON will fit the stock mount but i advise going alloy...you CAN fit it but piece of mind, safety, flex and minimizing motor shift should be high on your list of things to things if running a 4900 in a stock mount...
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