You can see the prices yourself at www.rockauto.com or www.gmpartsdirect.com. They're about $40-$60 if I remember right. You can borrow the tool for a $15 or $20 deposit from AutoZone or Pep Boys. Other places have them for borrowing as well. You might want to get a new water pump cover gasket and thermostat while you're doing that. Also don't forget the 2 tubes of Bar's Leaks Golden Seal powder or 6 Bar's Leaks large tablets for sealant. If your car is a 96 or newer, you need the DexCool (orange) stuff and distilled water to refill it. Put the powder or tablets in the hose, not in the surge tank or it could clog up the vapor vent line. The job is pretty simple start to finish. Just make sure you get that water pump cover gasket and sealing surface nice and clean and prepped for a good seal. Those things seem to leak if they're not cared for. I have compared the AC-Delco parts and aftermarket parts side-by-side, and the AC-Delco parts are far superior in construction to anything else. I don't mind paying the extra few dollars to get what was tested with and proven on the car.rwess said:How Hard Is It To Change A Water Pump On A98 Northstar? And About How Much Should A New Pump Cost?