2008 Mustang Gt - No Steering at High RPM


New Member
Oct 1, 2018
Los Angeles
I have a 2008 Mustang GT that has been turned into an SCCA T3 Racecar. Took it to it's first test day, and first session the car ran flawlessly. Second session, the car developed a power steering issue at high RPM. Anything below ~4800RPM, and the power steering works fine. Anything above ~4800RPM, and the steering cuts out completely. It doesn't just lose power steering, but goes into complete steering lock. Steering resumes once the car drops back down in RPM. The rack, pump and lines were original with about 35,000 miles on them. Flushed the system a dozen times, and replaced the pump, but the problem persists.

Any ideas?
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Founding Member
Dec 17, 2001
Dickson, TN
That's a strange one. Perhaps a valve flipping out? Fluid getting hot (Not likely the cause since it is at a consistent 4800)? Maybe the pump is damaged. Maybe underdrive pulleys would move the RPMs up. If the pump got damaged maybe underdrive pullers would lower the pump rpms and prevent damage to a replacement pump?