3/8 pin is fine, and 3 will work. space them out about the same as the factory rivets are. make sure you have a real good center punch when you go to drill your holes so the drill bit doesnt walk on you, because the gear is much harder than the cast. split the difference between the casting and the gear and drill it out. we always put some locktight on the pin before putting it in and then pean the edges over with a punch. pinning will be more durable then welding it.
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