Sorry if I have confused you. So far without any additional info I don't think the problem is the transmission. Ether the engine is weak or the converter is slipping due to a failure or lack of pressure or excessive load on the machine.
When in gear and tracks stalled if the drive line spins you ether have a slipping clutch pack or slipping steer clutches but based on your description that is not the case.
Does it sound like your engine is laboring, working, when in gear and reved up?
Does the driveline / engine act the same in all gears?
How did the problem develop or has it always been this way?
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