I agree with sleepy. If it's never been done, don't touch it. The clean fluid will clean off all the clutch material that's floating around and it won't shift at all due to there not being enough clutch material to take up the gap between the clutches and the steel discs. The shuddering is probably the torque converter clutch. So just run it as is and wait for the time when you have to put a new transmission in.
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