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Product Description
Idler Gear 28T:11T for Marui CJ-7/Land Cruiser. Might work on Big Bear too with a larger motor pinion.
Please note that 3D-printed gears will never be as strong as injection molded gears. I have some of these gears in my cars and they work for running the car carefully.
Use plenty of grease, make sure the gears are meshed properly and don't drive recklessly, i.e going from full reverse to forward or similar and you'll be fine.