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I can only speak to Blue Top, had all three power assist components rebuilt or replaced by Ryan, valve, cylinder (ram) and steering box. Nothing but a good experience for me, he had the valve and cylinder on the shelf, so I core swapped those. He rebuilt the box. Turn around time was great. He called me to thank me for my business and followed up on the install to see how it all went back together. I have been running all three components for a few months now and zero problems. All three components came with new castle nuts, cotter pins and shaft nuts. He also had the bushing set for sale and gave me break on that cost for the cylinder install. I have read around here that Red Head does the same type of work and have yet to see a negative thread about either of the companies, I don't think you could go wrong with either IMO. I would use Blue Top again, because my experience was flawless and personable. Blue Top is also run out of a small shop in rural North Dakota, and I like that.....