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If it's sliping while it's vibrating, it's low hydraulic pressure inside the transmission. Either low fluid level, a worn hydraulic pump, leaking o-rings or seals or a blocked filter. In any case, if it's acting that way, you'ver probably caused significant damage to the clutches, in which case you'll probably need a rebuild.

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Q: What would make a th350 tranny vibrate fearsly while shifting?
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