I don't know that I've seen it on a 4.4i before, but the 4.6is torque converter can go out at in such a manner to cause a supercharger-like whine under acceleration. If this fits the symptoms you might want to get it looked at really soon before it causes consequential damage in the transmission.

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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama)

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X5 pics

RIP 4.6is.....

2003 4.6is