Never forget to re-seal the gearbox with RTV right after you’ve got located the correct blend. Even however they are known as “gaskets”, they is not going to seal your gearbox on their own.
If everything appears regular, try out adjusting the equipment-mesh. This is carried out with the mylar “gaskets” that sit among the main gearbox situation and the enter/output caps. Consider incorporating or removing some of these spacers until your gears have roughly 1/8″-one/4″ of free 
perform. Pros can get replacements ($1-2) in varying thicknesses, but we advocate the fast and dirty approach of slicing your own out of a sheet of mylar.
“Groaning”, “creaking”, or “popping” all seem kind-of 
comparable over-the-telephone. The best thing to do is to disassemble your gearbox and get a search at the gears and bearings. The problem will generally existing by itself in the way of broken/missing equipment teeth, toasted gears (like that photo on our home web page), or blown bearings.
My Gearbox is Groaning/Creaking:
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