I have used Napa and Orielys without any problems. They are less than half of OEM part.
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.....but would you get your water pump from napa or orileys? I don't mean to be rude at all or a smart ass but I have never understood why more people don't buy OEM GM/Delco parts in the name of saving a buck. The OP stated his truck is 10 years old and the thermostats are not even failing! What more proof do you need that's the one you want the second time around. I happen to get GREAT pricing at a local dealership here in town. I've referred some of the Dmax guys I'm friends with to that same parts counter and they all buy their parts there now. That said I understand completely if a man flat out don't have the dough. It is what it is and sometimes we can't be picky.
on my dmax, ill buy Gm parts 90% of the time. certain things like a belt, o-rings, battery, ect ill go to napa first. if napa dont have it ill go to oreilys or autozone. unless i know napa/oreilys/autozone carries the same exact brand as the dealer.
James,
I just got the AC Delco's from Rock Auto.
They were popular replacements on the older diesels . . . guessing they're ok for the Duramax.
OK so here's what I found:
GMpartsdirect.com
$26.59 (Front)
$24.75 (Rear)
AC Delco (Manu)
GMpartsdirect (catalog)
$27.65
$25.74
AC Delco
Rock Auto
$26.79
$24.79
AC Delco
Autozone
$36.99 (front and rear package deal)
Duralast
Advance Auto
$36.99
$36.99
Stant
Carquest
$32.49
$33.69
?
NAPA
$24.99
$24.99
Standard-Thomson
Oreilly's
$36.99 (front and rear package deal)
Murray
Having said that, the internet prices are without shipping and the package deals from Autozone and Oreilly's scare me. Also I don't understand why there is a very small price difference between GMpartsdirect.com and their catalog.
So the best choice I have is NAPA. Let me know what you guys think.