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Hard Upshift - Automatic

Transmission

Vehicle Information: Year: 1987; Engine (size, modifications): 5 L; Total Mileage: 104000; Transmission type: Autotomatic;

I am experiencing very hard up shifts at below 2000 rpm and above 4000 rpm on all gear. There is no slip between gears. It also downshift immediately, no waiting at all, when done manually with the shifter. What is the likely cause for the hard up shift?

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