Response to Hi there, The motors can be swapped with no problem. The difference between a 48Y frame motor and 56Y is that the 48Y has a smaller barrel (i.e. is smaller in diameter). You can put the smaller 48Y frame motor on the pump base. The 48Y frame motors come with a rubber spacer to make up for the smaller circumference. If I'm not mistaken, most of the Sta-Rite pumps should be 48Y frame motors. If you have a 56Y on there, you may want to check the pump base/bracket. Sometimes when going from a 48Y to a 56Y, the base has to be cut to fit the larger motor. As for the impeller screw, the newer motors don't need it. You can simply thread on the impeller and you do not need the impeller screw. As far as I know, only the OEM branded motors would come with the opening in the shaft for the impeller screw. Here is a good article on the topic Do I Need a Impeller Screw For My Pool Pump Motor.

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