I used 80 weight gear lube in mine with no problems. Mine of course has the fill and drain plugs. Cub manual recommends filling until it runs out the bottom plug, about 30% volume I would guess.
CaptMax
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CC 1964 Model 70 Serial# 78905
Creeper gears, Round fenders, Spring assist.
CC 1965 Model 102 Serial# 127109
Creeper gears, 3 point, Carlisle AG's, headlights, and a cigarette lighter.
42" Blade, Brinley plow, 42" mower deck, 1A tiller, QA36 snow thrower
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