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I've got some wobble going on at the pulley of my water pump/fan and figured while I was putting an e-fan in I'd just replace the water pump and be sure everything was done. There are two acdelco pumps listed at Autozone / O'Reilly's and the listed difference is "hub height" one is a 3" the other is 2.187", I couldn't find any information on this so.... Short of tearing into things and measuring how do I know which one I need?
 

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If you've got another vehicle, I'd take yours off an take it with you. If your truck is the only vehicle you have, buy both and take the wrong one back. I've replaced my water pump and there weren't any options.
 
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