Power steering problem, need some help

[93GMC]

Might be worth replacing the pump... no squeaking or whining ?

[Chevlowrider]

Might be worth replacing the pump... no squeaking or whining ?

At first no but after driving it for a little while it starts to whine

[kewljay223]

i had my lines reversed and it whined at higher speed. but there was also foaming though unlike yours. id double check your lines and if that isnt it, then id throw a new pump on.