I have a 77 F250 High Boy which I just swapped in a rebuilt 400. Runs great, I have power assist steering, but it is intermittent. it's easy, then hard, then easy, then hard. I am not sure if I should bleed the system or put in a rebuilt unit. Has anyone experienced this or done a power steering swap?
You can get air out of the system by making sure the reservoir is full and then turning the steering back and forth to the stops several times with the truck running. Be careful not to hold the steering at the stops for any extended time as this may damage the Gearbox/pump.
Also recommend checking any U-joints in the steering shaft for looseness and/or binding. Notorious for steering problems.
I did a power steering conversion on my '74 highboy about 16 years ago. The kit was from a guy in Iowa named Scott Ibeling. It uses a 73-79 2wd power box that can be cheap to find. Simple setup that works excellent and has more clearance at the drag link side for wide tires. My dad bought this truck new and the power steering was junk from day one, it used to get so stiff in our Minnesota winters that he cracked the steering wheel trying to turn it. I can post the kit info if anyone's interested.
Not sure if I can post phone numbers here, but I will anyway. Ibeling Repair Service (319)347-2491. Scott knows everything about power steering, and has made these kits for 20 years! I have a 71F1004x4 and a 68F2504x4 both with the kits. Worth every penny.
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