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I have a 2008 4wd V8 Ford Explorer Limited. About 9 months ago I had both front wheel bearings replaced. Immediately after they were replaced, I noticed a strange, new symptom. When taking off from a stop (either headed straight or turning), about 10-20% of the time I will get some wheel slippage. I can feel the gears slipping, I don't think the tires are actually spinning and I'm definitely not flooring it and losing traction due to engine torque. When this slippage occurs, the loss of traction light goes on, and it always goes away in a matter of seconds and then everything is fine.
Once I noticed this happening I took it to the Ford dealership but they couldn't diagnose it since I couldn't mimic the problem with them riding in the car. They said it shouldn't have anything to do with the wheel bearings they replaced, but I think there may be an electrical connection that wasn't re-attached properly??
Based on your description, and that it happened after they changed wheel bearings, about all I could think of is that they maybe damaged one of the wheel speed sensors or tone rings, kinked a brake hose (does the Explorer coast fine, or seem to pull or slow rapidly when letting off the accelerator?), or they possibly damaged a CV joint. Since it does this turning or driving straight, the CV joint seems unlikely since typically the inner CV joint would act up on straight acceleration and the outer CV joint on turns, rarely both at once. Also, that would not trigger the Traction Control light to illuminate.
My bet would definitely be on an issue with the wheel speed sensor/tone ring since those are in the same area as the wheel bearings. Maybe you need to have the dealer connect their scan tool to your Explorer and have them monitor the wheel speed readings in real time while you drive to make sure they are all tracking correctly.
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