Watched video and followed procedure shown. I did use the Styrofoam "hat" to keep the tube from banging when I laid washer on front.
Noticed vibration and pulsing sensation on startup test.
Mounting brackets changed from original, thought I might have unevenly tightened or over tightened mounting screws.
Removed pump, reinstalled tried to tighten screws uniformly. Vibration pretty much gone.
Pulsing sensation still there, due to pump starving since a timer keeps the pump on for a short while after the tub is drained.
The new pump has three impeller vanes instead of four like the original. The casing also slightly smaller. Motor RPM probably higher.
Pump seems stronger pumper than original.