I screwed up Photo posting so badly last time so I hope I do better this time
I have installed Electric power steering From an 08 Totyota Yarus in my 56 Fairlane. The Yaris unit is column mounted and drives the steering box worm shaft based on the amount of torque you put on the steering wheel. I will say it has plenty of power as I was tuning the wheel lock to lock with 1 strong finger while sitting on a concrete floor on underinflated radials. (I have the black marks on the concrete and flat spots to prove it LOL)
I finally got to take the car for a ride now that the roads are free of slush and salt, I almost lost it on my first turn out of the driveway as I am used to grabing the wheel with both hands for the tight turn. Lets just say the wheel can now be palm steered, it returns to center just like it always did, I like it so far but only drove about 10 miles as the roads are not completely clear and my inspection is expired.
I am going to try 1 picture first and see how it goes, the pic is of the Yaris EPS unit, Will follow up with what I did to install it. The end you are looking at is the output end
Next is a Photo Of the modified Shifter shaft, 56 Worm shaft shortened with spline coupler to mate with the Yaris Output and the upper shaft with spline coupler to mate with the Yaris input
Next is the lower Column tube with a flange welded on the end to mount the Yaris unit, note the worm shaft with coupler inside the tube.
Next is the unit bolted up to the flange and coupled to the upper column tube
Next is what it looks like looking thru the wheel
And a view looking up under the Dash
I have it running in full power mode right now but with the proper Vehicle Speed Sensor it could be made Speed sensitive, less boost at highway speed, more at low speed. At this time I am putting together a list of what Yaris units will work, the unit requires an Electronic Control Unit (ECU) and as far as I can find out so far the ECU has to be 2007 thru 2009 Yaris without ABS. The motor is a little less critical 2005 thru 2011 Yaris and Prius work