I don't really think there is an "easy" or "cheap" way to add power steering to a straight axle truck. Guess it would depend on the capacity of your wallet.
One solution, which I happen to like and plan to use when budget allows, is the Rack and Pinion setup by No Limit Engineering.
Link: POWER STEERING STRAIGHT AXLE-No Limit Engineering (scroll down under size/color for the 61-64 setup). Cost is $599, plus you will need to buy a power steering pump and either replace steering column or cut your current column off in order to hook up the R&P to the column. (How to instructions are on the site). Note: If you have a Y-block, you can find PS pumps fairly easily, if you have a 223 I-6, PS pumps are almost impossible to find (unless you can fabricate a bracket).
Others have used a Toyota box but I don't know much about that setup.
You might first try making sure your current front suspension is in good shape (king pins/bushings, tie rod ends, steering box, alignment, etc.) before you make the PS change. You may find that by tweaking the front suspension (which you will need to do to have a good, safe setup with the R&P) you will not need the PS (or maybe not need it as much).
LITTLE RED: 64 F100 Short Style
BIG RED: 63 F100 Long Uni
BIG “UN: 63 F250 Long Flare
RUBY: 61 F100 CC BBW Long Uni
CRIMSON CREW 63 F100 "Stageway"
"RANGER" 66 F100 CC Long Flatbed
Everything to put in power steering requires fabrication skills.
98 528I BMW
64 F100 "Christine II" 390 NP435 6" lifted 2 wheel drive
63 F100 Uni Custom under construction 4" off the pavement and built to drive.
69 M250 Crew Hiboy 472 C6 Ranger, getting a full rebuild.
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