AlaskaBill
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There is a different WP for 2000+ 6.5's that balances flow? I would be interested in any information on that!the AC Delco pump from a 2000+ 6.5 will get you all the updates that GM did balancing the flow. This will get you the spin-on style pulley where you will need to use a different clutch. two good options here. If you go with the Hayden thermostatic clutch you will need ether the 9-blade steel fan (I have one available) or the d-max plastic fan. the second option and one of my favorites is the electro-viscous fan clutch coupled with a Hayden electric fan controller. Just lookup the application for a 2010-11 3500 express van with the d-max engine for both the clutch and fan blade.
Credit is due to @ak diesel driver for this as he put this together for us on our trucks. I can get you the part numbers if you need them, everything is available on RA using all AC Delco parts except for the fan controller. this setup will allow you to set what temp you want the clutch to engage and also have ether an override switch in the cab or have it wired into the AC system when the AC needs a fan but the truck might not be up to temp and a normal fan clutch wouldn't help. all of these mods are direct bolt on and no molesting under the hood required, allthough it's highly recommended to plan on installing new motor mounts and possible trans mounts due to the larger fan blade possibly contacting the fan shroud.