I'd replace the whole pump . . . and go to a 2-speed! Check on what rebate you can get from your power utility -- it may be substantial.
Take a look at this page: http://www.a1poolparts.com/-strse-Pu...Categories.bok for pricing. Allow $50 or more for shipping. A1PoolParts has *seemed* reliable; I've used them myself a couple of times, and they do have a physical location and a real store, so they are not like a lot of the Internet sites that are just an office, with 10 pool guys who can order for them.
You'll have to add either a timer or a toggle switch:
Intermatic T10604R Pool/Spa Control Center T106M and T104M @ Amazon
Southwire 55189301 3/4-Inch 6-Feet ULTRA Whip-Pre-Assembled with Wires and Connectors @ Amazon
Leviton 1282 15 Amp, 120/277 Volt, Toggle Double Throw @ Amazon
But, you should get payback -- even without a rebate -- in a year or two, and you'll get a MUCH quieter pump, as well as BETTER filtration. (All filters work better with slow flow for more hours, rather than high flow for fewer hours.)
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