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overfilling can cause high pressure inside the transmission valve body and can accually damage the solenoids that control shifting. if the solenoids have gotten weak, they can cause the transmission to hold shifts longer then it should, or not shift at all. try changing the Transmission Fluid completely. there is a 15mm drain plug on the bottom of the transmission. the transmission holds 3.75 quarts with a new filter. if this does not solve your problem, you may have to replace your solenoids, which can get quite costly.

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Q: Why does my 91 Saturn automattic transmission drag or shift hard it had been overfilled too?
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