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Have you checked the fluid level?
You have to check the fluid level with the engine running, and the transmission in neutral.
Does it start winning as soon as you put it into gear? Does it do it in neutral?
It sounds like it is starving for fluid. A filter change may do some good. When you drop the pan, can you send me a pic of the bottom of the pan before you put the pan back on please? This way I can see what may be going on inside.
When you drop the pan, do not let all of the fluid drain out of the pan. Leave a small amount so the paticals in the pan does not get washed out.
You are very welcome. Chat with you in the morning.