My '98 also leaked. I took it in under warranty, and they fixed it. It hasn't been a bother since.

I also had a leaky right front axle, leaky oil filter hoses, and the chattering rear end - NO, not mine;-)

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1998 F-150 XLT 4x4 SC/SB 4.6L, Auto., 3.55LS, TTP, blah, blah, blah
All the info is at http://www.fordf150.net
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