The diameter of the 64T hole of the main metal spur gear of the differential is 5mm, and the diameter of the 26T hole of the motor gear is 3.17-3.18mm.
Compatible with 64T 11181 motor pinion 17T 21T 26T 29T truck etc. Please confirm your model carefully before purchase.
Please add lubricating oil to reduce friction between metal gears and make the running sound less.
The differential main metal spur gear 64T is made of high quality metal and the differential steel main metal gear 64T is designed for long-term use.