i have an 82 300d turbo about 200k miles on it runs good, but the transmission is acting pretty funny. It shifts really fast 4th gear at 30mph which seems weird to me, it also downshifts harsh when its warming up, the upshift is fine but when im slowing down the shifts are harsh and fast, until it warms up it gets smooth but still fast. I was told im maybe missing a restriction orifice, but cant find much information on it. you guys have any input on what could be going on? Thank you!

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