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1990 Lumina: Shifting hard into overdrive


LUMINATOR
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I have a 1990 Lumina with a 3.1, that has been shifting hard into overdrive. When you reach 45 mph the car shifts hard into OD. But 1st gear thru 3rd gear shift just fine, nice and smooth. If anyone has any idea on what could cause this problem I would really appreciate the help! Thank you.

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