I'm setting up a truck with 12V electric steering, the 12V's run a hydrualic pump. Question I have is about the hydrualic flow aspect of it. I'm using the factory power steering box (78 4x4 Ford Truck) and have found a setup that will work for me on Northern Auto Parts, The PSI is adjustable from 1000-2500psi, so no problems there, but it only flows 1.4GPM, I'm not so sure that's enough, the truck doesn't need to steer a lot, very little actually, it's a pulling truck, so it would need to steer about as much as a drag car does, but my front tires are gonna be pulling be back and forth, plus I'll have at least 1,200lbs of extra weight on the front, so it needs to be effective. I just don't want this thing to have a "loose belt" or "-20F degrees" effect all the time. I'm kinda thinking it needs to be at least 2GPM or 2.4GPM.

Any suggestions, input or information on how much a factory power steering pump flows would be helpful.

 

Here is some info that you may find usefull.
I run a modified saginaw pump, and I am assuming that you are probably using a similar pump, as these are the mose desired pumps for performance applications.

My application is not even close to yours, but the principles are identical.

I run a pump that has been modified to flow right at 1500 psi, and a volume of almost three times of what you are expecting to produce. I see volume in excess of 4 GPM, but have to run a rather large cooler to maintian some sort of heat exchange since there is so much flow.
Often the fluid gets pumped so fast that heat never gets a chance to become exchanged and the system overheats. Just as bad if not worse than cold situations.

Enough aout mine, your design has some variables such as rpm, as well as pulley size. Hydraulic volume requirements for the box, as well as any types of pressure limitations.

I will also tell you that not all pumps flow with a linear output. I have seen this many times, and have found that high rpm output if where most are rated at, and slow rpm's can have results that vary quite a bit.

At any rate (no pun intended) I believe that your system might fall a bit short due to volume at 1.4 GPM.
Your box wont take more than about 1400 PSI, so watch this area carefully, and do put a gauge on the system so you can verify this.

Hope this gets you in the ballpark:

 

My pump is actually all one unit. It's a self contained motor and pump, plus the resiovoir, so it's not an automotive pump. So there are no pulley's or anything to change around. I'm sure if you have power steering on your F-350 you are well aware of the 77.5-79 box swap which is what I did. Anyways from what I can tell from these Saginaw's is that I'm gonna be about 1 GPM short of there mininum. I'm not worried about it overheating since I'll only use it for a minute at a time and it has a 3 quart resivior. As far as finding these setups there isn't anything in 12V that flows anymore then this from what I can find, I heard from a friend that another guy runs a similar setup on Dodge Cummins pulling truck and claims it works great, I really can't see how, but..... I'd like to know for sure what he has.