Do not neglect to re-seal the gearbox with RTV soon after you’ve 
located the right mixture. Even although they’re known as “gaskets”, they won’t seal your gearbox on their own.
If every little thing seems regular, try altering the gear-mesh. This is carried out with the mylar “gaskets” that sit among the primary gearbox scenario and the input/output caps. Attempt introducing or eliminating some of these spacers until finally your gears have around one/eight”-1/four” of free perform. Professionals can purchase replacements ($one-two) in varying thicknesses, but we recommend the fast and soiled approach of cutting your personal out of a sheet of mylar.
“Groaning”, “creaking”, or “popping” all seem kind-of equivalent in excess of-the-mobile phone. The best factor to do is to disassemble your gearbox and consider a look at the gears and bearings. The concern will n
ormally existing by itself in the way of broken/missing equipment teeth, toasted gears (like that photo on our house web page), or blown bearings.
My Gearbox is Groaning/Creaking: