faulty bearings, bad spur/pinion gear mesh, slipper clutch is to loose or gone bad....
I had a bad squeak/squeal in what I thought was my trans but turned out it was the out put shaft bearings had gone bad.
As for the brushless upgrade, for some ppl they swear by the brushed tuned/mod motors. If you get a good brushed motor all you have to keep up on is changing out the brushes and keeping it clean and it should do you just fine for bashing or even racing.


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