I just traded my 2001 2500 quad cab 4x4 5 speed on a 2004 3500 quad cab 4x4 6sp HO engine. I have oil and fuel filters left from the old truck will they work on the new one? I checked Gino's garage site and they say all years just want to check here. Thanks Also, I am waiting for the heater cord to come is it a big deal to install?