I have two questions about 1949 Plymouth P18 , first is related to gear box capacity? and second is about some noise in gerar box to change second to third in higher speed, if I shift at 15 miles per hour is Ok if speed reach above 20 miles per hour it always dificult to change whithout some noise as a light crash in the gear box, if we use double foot on the clutch is Ok, but just one it sounds a crash on the shift gear ...just it...It is normal for the age of the car and specs of gear box? Thanks for experiences changes.