I need to know which power steering option I have on my '01 1500 4X4. I've decoded all of the RPOs in the glove box but none are for power steering. It's possibly included in one of the option package RPOs but I just don't know.Turning is very difficult at idle or very slow speed and it's getting tough to manuever into parking spaces. I'm figuring it's the pump, but I don't know which one. GM has 4 RPOs listed that I could find. (variable or non-variable ratio, variable effort or special steering)

Any ideas out there?