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The most likely culprit is the pressure control solenoid in the transmission. The other concern would be that you have a trouble code set that hasn't caused the service engine soon lamp to come on, but is set due to something inside the trans. I would get the vehicles computer scanned to see if it has any codes set. Worst case is the trans has caused a code p1811 to set which could mean that the trans is failing which is causing the adaptive pressures to be at there max limit. Russtech67

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Q: Why would a 2000 Buick Regal vin k transaxle sometimes shift hard going up?
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