Gear sound?

[Jeremy1976]

I am and was running the 32 pitch gears on my Rustler. When I had them on my Slash I noticed when turning the spur gear or pinion they made a kind of grinding sound. It ran fine with no issues and rolled freely when pushing it along. I now installed the same gears on my new Rustler and notice the same thing. Is this a common thing with noise? It is more like a grinding and it kind of clicks when you turn it. I tried setting the mesh tighter and looser and still got the same thing. I am using a 19t 0.8 pinion with a 56t 0.8 spur. Like I said you push it and there is no binding or anything.