Do you have to drop the engine on a Plymouth Voyager change timing belt?

No, you do not have to drop the engine on a Plymouth Voyager to change the timing belt. Access is difficult, but it's a job that can be done with the engine in the vehicle. You will need to remove various components to gain access, including some plastic covers, potentially the power steering pump, and possibly other components depending on the year and engine. Consult a repair manual specific to your Voyager's year and engine for the exact procedure.