Steering requires over correction at High Speeds only.
My 2003 Jeep Grand Cherokee limited with 50k orignal miles has a steering problem at high speed only. I've had the alignment checked twice and is fine at low speeds. However, at around 70+ mph, it requires additional steering correction to keep the vehical in the lane. Seems to be additional drifting.
What could be wrong?
Are your tires over or under inflated?
I tested and inflated both tires to 35 psi prior to trip. Both tires do tend to loose pressure over time. Maybe it is tire related. I had read that a loose powersteering pump belt can cause this symptom as well. I've not looked into that yet.
Did the alignment shop also check out your steering rack and other components?
Hope you find out the answer to this ?.. I've spent over 2000 dollars in the past two years at Jeep dealerships. STILL NO HELP. I just thought I bought a lemon. Bought new with 3 miles on it and it's been nothing but a money pit.
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