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Better quality image of 42139. When we looked at smaller photo with engine, we clearly see a Gearbox here! : r/legotechnic
![Amazon.com: LEGO Technic Monster Jam Grave Digger 42118 Model Building Kit for Boys and Girls Who Love Monster Truck Toys, New 2021 (212 Pieces) : Toys & Games Amazon.com: LEGO Technic Monster Jam Grave Digger 42118 Model Building Kit for Boys and Girls Who Love Monster Truck Toys, New 2021 (212 Pieces) : Toys & Games](https://m.media-amazon.com/images/I/81gMn-VVTsL._AC_SX425_.jpg)
Amazon.com: LEGO Technic Monster Jam Grave Digger 42118 Model Building Kit for Boys and Girls Who Love Monster Truck Toys, New 2021 (212 Pieces) : Toys & Games
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