Do not fail to remember to re-seal the gearbox with RTV following you've got identified the proper mix. Even although they are called "gaskets", they won't seal 
your gearbox on their possess.
If everything seems to be standard, try modifying the equipment-mesh. This is accomplished with the mylar "gaskets" that sit between the main gearbox case and the enter/output caps. Attempt introducing or eliminating some of these spacers till your gears have roughly one/8"-1/four" of free perform. Professionals can order replacements ($one-two) in various thicknesses, but we advise the swift and dirty approach of reducing your possess out of a sheet of mylar.
"Groaning", "creaking", or "popping" all seem kin
d-of similar more than-the-mobile phone. The ideal thing to do is to disassemble your gearbox and consider a look at the gears and bearings. The situation will usually current alone in the way of broken/missing equipment tooth, toasted gears (like that picture on our residence webpage), or blown bearings.
My Gearbox is Groaning/Creaking: