Hydroboost or vacuum booster power steering pump on 1993 gmc sierra?

sniperlif3

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I have a 1993 gmc sierra with a chevy 350 engine 2wd that is having some power steering pump problems so i am going to replace it. I looked at autozone and they offer two different types which are:
Hydroboost
http://www.autozone.com/autozone/parts/D…


Vacuum Booster
http://www.autozone.com/autozone/parts/D…


What is the difference and which one do i have?
 


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