1998 Ford Windstar

On a flat road , the van runs fine, but on a pull up hill, the tranny seems to be hammering or for the lack of a better word, jumping, like it wants to switch gear, but wont. Any one have any ideas? New tune-up, fuel filter, fuel pump, catalitic convertor, no one seems to be able to figure it out. Please ASAP?! Thank You!!

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JimboM
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