Definately use the tape.
The simplest way of explaining it is this knock 2 metal things together and then knock two plastic things together imagine they are crown gear teeth....... Which is louder????
Metal on metal.
Just keep them greased up and you'll be fine. The drivetrwin will never be 100% quiet not like the 502 or B44. You can tell which Durangos are running a little dry during a race because they sound like a bag of hammers.
