My GEM differential has been getting gradually louder and whineyer (if that’s a word). .so I figured it might be time to check the oil in there.
Looked for the traditional screw-out access plug on the front. .sides. .back. .top. .NO LUCK
Asked GEM support about it, and they said it was on the bottom. .which made NO sense to me whatsoever. .so. .today I actually found a light and looked under there. Found a little smooth rubber plug about 1/3 up the front passenger side of the front of diff. .pried it out. .stuck my finger in, and pulled it out DRY
Got out my handy gear oil pump,and put in about 3/4 of a quart of 30 weight.
Seems to run MUCH smoother and quieter now, and looks like I’ll get much better mileage without those gears fighting themselves.
My lesson: GEMs might not need gas, but they SURE need oil.