Don’t forget to re-seal the gearbox with RTV after you’ve identified the proper mix. Even although they are referred to as “gaskets”, they won’t seal your gearbox on their own.
If almost everything appears standard, attempt changing the gear-mesh. This is carried out with the mylar “gaskets” that sit in between the main gearbox case and the input/output caps. Attempt introducing or eliminating some of these spacers until finally your gears have about one/eight”-1/4″ of free of charge enjoy. Pros can purchase replacements ($1-two) in different thicknesses, but we advise the rapid and dirty method of chopping your very own out of a sheet of mylar.
“Groaning”, “creaking”, or “popping” all seem variety-of equivalent over-the-telephone. The very best thing to do is to disassemble your gearbox and get a search at the gears and bearings. The issue 
will typically existing itself in the way of broken/lackin
g equipment tooth, toasted gears (like that photograph on our property web page), or blown bearings.
My Gearbox is Groaning/Creaking: