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

[sniperlif3]

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?

 

[Vacdaddyt]

hydro boost

The hydro boost system uses the power steering pump to supply power assist for the brakes. Lines go up to the brake master cylinder from the pump. Vacuum operated uses the round tank and the vacuum off the engine to help with the brakling. Look to see which is on the truck, they are quite different.
Roger