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Chipstien, This is my theory on how this works. I may not be totally accurate,as I am not an engineer, but I do know that it fixed my problem. The power steering pumps are capable of creating much more pressure than is needed for normal use. By shimming the spring in the pressure relieg valve...

hammersley,and others interested, Take the p/s pressure hose off the back of the pump. Take the large nut (approx 1") that the hose was threaded into ,out. Use a magnet to reach inside to pull the pressure relief valve out. While carefully holding the valve,use a 7/16" wrench to remove the...

My Dead Steer is Alive ! I bought a 2001 4x4 last year and quickly noticed a problem with the powersteering while sitting still. The dealer replaced the p/s pump twice under warranty and gave up on the problem. After replacing the hydroboost and the gearbox myself to no avail, I read sag2's...