Clunking noise when accelerating

What would cause this problem only has reverse now

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What exactly do you mean when you say "only has reverse now"? Are you saying it won't move in any forward gear? If that's the case, I'd worry about that before being concerned with a clunking noise, so please explain a bit more about the problem; you really haven't given us much to go on.

What year is your Ranger? What engine and transmission do you have?

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