Q: I am having problems with the RPM. on 1999 Plymouth Breeze

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My car shifts or knocks hard when driving normal on the streets and highway. Yesterday, while driving at 55 mph there is a howling, pitching sound/noise.
(1) Answer
3 speed or 4 speed transmission? Big difference in operation. In either case, check your transmission fluid level. If ok, My suggestion is to take the vehicle to a reputable repair shop of dealership in your are for diagnosis. Here is a link to your local repair facilities.