Update on Power Steering Pump Flow Modification

[stanski]

I recently posted my plan for modifying my steering pump to give the steering a firmer, less assisted feel. I ordered a pump output control valve from Turn One Steering, part # PN1115. The stock GM can of ham pump delivers a flow rate of 3.0 gpm. Their PN1115 delivers 1.3 gpm which they advised was too low to allow the power steering box to work properly, and instead special machined one to deliver 2.5 gpm. These guys manufacture stuff for the circle racing crowd.
I installed it today, took 1 hour and the valve cost $40. Boy, am I impressed with the results. My 74 Jimmy now has a wheel feel somewhere between my new Duramax which I like, and my new Traverse which is quite stiff. So if you are dissatisfied with the vagueness of the 70's concept of power steering, here is a cost-effective and easy upgrade to make you feel like you're driving a new truck.