I bought this set and the Lego power supply so my son can get his creations moving. I found that the regular Technic parts we had were not enough for a reliable drive. The play in them (yes they wear out) would cause the gears to jump out of alignment. Also, our floors don't seem consistent with a wheel drive since cars will never go straight. This good differential setup solved all my problems. The only thing REALLY weird about it is the 5 "bumps" in the transverse area. As most people know, there can only be an even number of Lego bricks. So you end up building a fairly large vehicle to compensate for this device and engine to provide symmetry.
City Police Station Building Kit With Cop Cars, Police Helicopter, Prison Van, Fun Police Toy For Kids, Best Roleplay Police Department Construction STEM Toy Gift For Boys Aged 6-12 (808 Pieces)
23 Review
STEM Engineering Construction Set For Kids Ages 6-13 - Crane Truck Building Blocks Educational Learning Kit Gifts For Boys & Girls
10 Review
80 Piece Quercetti Tecno Building Set
14 Review
655 PCS STEM Robot Building Toy Set - 6-In-1 Fire Truck Kit For Kids Age 4-8
19 Review