Never forget to re-seal the gearbox with RTV following you’ve found the proper combination. Even though they are known as “gaskets”, they will not likely seal your gearbox on their very own.
If every little thing seems regular, attempt modifying the equipment-mesh. This is done with the mylar “gaskets” that sit between the 
principal gearbox scenario and the enter/output caps. Attempt introducing or getting rid of some of these spacers until your gears have 
about 1/eight”-one/4″ of free of charge enjoy. Professionals can purchase replacements ($one-2) in varying thicknesses, but we advise the quick and dirty approach of reducing your very own out of a sheet of mylar.
“Groaning”, “creaking”, or “popping” all sound kind-of comparable in excess of-the-phone. The best thing to do is to disassemble your gearbox and consider a seem at the gears and bearings. The situation will generally current itself in the way of broken/lacking equipment tooth, toasted gears (like that photo on our property website page), or blown bearings.
My Gearbox is Groaning/Creaking: