ATF is probably your best shot to free it up but the problem normally is the retainer gets small scratches in it from the dirt and that is what holds the lifter for a second. Worth a shot though. If you do need to change them in can be done in a day but gets pricey for the gaskets and you can't re-use alot of the bolts.
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-Nick
9/11/01 NEVER forget!
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