Silverado Needs a Water Pump--GM Techs?

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2001 with 5.3 V-8. It looks like there are 2 pump styles, 1999-2003 and 2004-up. Each type requires a different thermostat and housing. I've read that dealerships are using the later style for everything. Is there any benefit to using the newer pump? The older style pump and t-stat/housing are still available. Thanks
 
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 Originally Posted By: Rhymingmechanic
Is there any benefit to using the newer pump? The older style pump and t-stat/housing are still available. Thanks
Good question! I have a '01 Silverado and my G/F has a '02 GM Sierra, both with 5.3 engines. Both are in great shape without any signs of a water pump problem. I think the two styles would preform the same, but the cost may differ on what style you choose- keeping your old thermostat and pulley if applicable. If I may approach this from another direction, the only negative thing on an 99-03 style water pump is that your choice of a new (not rebuilt) replacement would have to come from AutoZone (Duralast) or Kragen O'Reilly (Cardone), unless you can find new old stock OEM or an AC Delco. A new "one size fits all" style (99-06) from AutoZone will probably cost a little less then a AC Delco pump from a Distributor. If I recall correctly and I'll stand corrected if I'm wrong, Gates manufactures AC Delco and some NAPA water pumps. The choice there would be either a Gates, NAPA, or AC Delco water pump. Those pumps will definitely be the updated 99-06 style. That seems to be the direction I would go even though a thermostat would be an additional purchase and no looking back.
 

Rhymingmechanic

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Thanks for the replies so far. Rockauto lists a 99-03 AC Delco. Napa shows the same part number for 01 and 04. I'm mainly wondering whether the redesign was to improve performance, or just to simplify parts inventory.
 
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