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Could your auger shaft be bent? The bow in a bent auger shaft will pull the impeller in and out as the auger rotates.
 

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Some snowblowers have a washer between the impeller and the auger shaft ball bearing. Is there a change that you didn't put everything back together (like a washer), or tighten the bolt probably? If so, it will surely move back and forth. It should only have a very small free play.
 

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I think I remember reading about an adjustment in the older gearboxes at the end of the impeller shaft that pre-loads the bearing/bushing. A member was advised to adjust the nut to just remove the free play along the impeller shaft axis. Too much and it binds, too little and there is free play.
 
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