Never fail to remember to re-seal the gearbox with RTV soon after you’ve identified the right mix. Even though they are named “gaskets”, they won’t seal your gearbox on their personal.
If everything looks standard, try adjusting the equipment-mesh. This is done with the mylar “gaskets” that sit in between the major gearbox circumstance and the enter/output 
caps. Attempt adding or getting rid of some of these spacers until finally your gears have about one/eight”-one/four” of free play. Pros can get replacements 
($1-2) in various thicknesses, but we advocate the fast and soiled approach of slicing your possess out of a sheet of mylar.
“Groaning”, “creaking”, or “popping” all seem variety-of comparable above-the-cellphone. The greatest point to do is to disassemble your gearbox and take a look at the gears and bearings. The problem will normally present itself in the way of broken/lacking equipment tooth, toasted gears (like that image on our home page), or blown bearings.
My Gearbox is Groaning/Creaking:
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