Never fail to remember to re-seal the gearbox with RTV after you’ve got identified the right mixture. Even although they are called “gaskets”, they won’t seal your gearbox on their own.
If almost everything seems regular, consider modifying the gear-mesh. This is accomplished with the mylar “gaskets” that sit in between the major gearbox situation and the enter/output caps. Try incorporating or taking away some of these spacers until finally your gears have roughly one/8″-one/4″ of free play. Experts can buy replacements ($one-2) in varying thicknesses, but we suggest the rapid and soiled method of cutting your possess 
out of a sheet of mylar.
“Groaning”, “creaking”, or “popping” all sound type-of similar in excess of-the-telephone. The best thing to do is to disassembl
e your gearbox and take a appear at the gears and bearings. The issue will typically current itself in the way of broken/missing gear teeth, toasted gears (like that photograph on our residence page), or blown bearings.
My Gearbox is Groaning/Creaking: