I'm no way an expert on QA snow throwers but on the QA36 I have and the others I've been around, they all have 4 bolts in different positions that hold them to the subframe and they have stamped covers. Is that an older gearbox modded to fit? I can't see them changing to a cast cover since that would be more expensive to produce. When I rebuilt mine, I did the 50/50 method and added a grease zerk to the top so I can add in a pump or 2 of fresh cornhead grease every so often.
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