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Tranmission challenge for the experts HELP 900

My 92 940 with 65K miles and AW 03-70L trans shifts strangely when hot.

When cold everything is normal. When hot however when you shift from reverse to drive it is a very soft hardly noticable engagement, and seems to partially engage in forward and then after the car moves forward about 6-12" there is a clunk and it is then really engaged. Before the clunk it takes more throttle/power to make the car move like there is something holding the car from rolling. It is almost like a stuck brake but it isn't. I have changed/flushed the fluid and it didn't do anything. Now I don't know if I should clean the valve body or what.

Does this sound like a sticking accumulator piston or brake piston.






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