Never forget to re-seal the gearbox with RTV following you’ve located the appropriate blend. Even though they are referred to as “gaskets”, they is not going to seal your gearbox on their own.
If everything appears regular, attempt altering the equipment-mesh. This is done with the mylar “gaskets” that sit in between the primary gearbox scenario and the input/output caps. Consider incorporating or eliminating some of these spacers until your gears have approximately one/eight”-one/4″ of free play. Professionals can order replacements ($one-2) in varying thicknesses, but we advise the quick and dirty technique of cutting your own out of a 
sheet of my
lar.
“Groaning”, “creaking”, or “popping” all seem sort-of equivalent more than-the-phone. The greatest issue to do is to disassemble your gearbox and take a appear at the gears and bearings. The issue will generally present itself in the way of damaged/lacking gear tooth, toasted gears (like that picture on our residence page), or blown bearings.
My Gearbox is Groaning/Creaking: