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I just did some work on the motor changing spark plugs, coils, 02 sensor now that the car is idling fine and not losing power no check engine codes

Getting onto the highway from 20 mph to 60 mph the transmission jumps and holds the gears like its in sport mode. when i take it up to 80 mph from 60 mph the transmission jumps again and holds in 4th gear and then the transmission light comes on but when i turn the car off and back on the light goes off.
And i dont feel the jump when slowing down only when accelerating.

Side note can i use the transmission from my 06 bmw 530xi if i worse case need to replace the transmission?
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