As for sanding the diff outdrives, which part of the outdrive are you actually sanding? I'm still getting slightly leaky diffs so I'm trying everything. Do you sand the bur off the end of the outdrive? I'm a bit confused...
I've got the mugen super grease coming so I'm going to grease the o-ring (been using associated green slime), outdrive and shim behind internal bevel gears. When you grease the outdrive, are you placing grease in the slot on the outdrive?