I have been noticing lots of changes to rc that are becoming mainstream, 2.4Ghz, Brushless, Lipo, lay down shocks and so on, and I understand it, now i see many cars (mostly 1/8 offroad) are being equipped with spiral cut diff gears.

WHY? as far as i know in the auto industry, straight cut gears are always stronger, but always louder and that is why spiral gears are used in most passenger cars, however spiral gears in this application are less durable, this is why race cars use straight cut gears in gearboxes and straight cut cam gears, noise is not a issue for this application. spiral cut gears also induce more side-load due to the gear mesh wanting to push away from each other and are less efficient due to high friction.


so I ask, are these gears just quieter or are they any more or less durable than the straight cut counterparts? or is it just another gimmick?