I only replaced the motor. The original motor was an 1.5hp AO Smith BN35. The new one is a BN35SS. I also replaced the seals. Along with switching the power cord from old/new motor. It has cooled down now and I rechecked the tightness of the impeller. It was fine. Plugged it in and everything looks good except the motor makes a noise when it is running. Not quiet, sounds like something is loose on the shaft. Took the impeller off and ran the motor, same noise so I know it is not the impeller. I am going to see how long it runs before shutting down.