They install as direct replacements with basic hand tools for a quick repair or tuning change

ARRMA ARA320601 Front Splitter 1/7 Felony 6S

1V 450mAh LiPo battery with a matching JST connector

Powerhobby Hardened Steel 35T Mod1 8mm Pinion Gear with 2 Grub Screws

Do you need to replace the Chassis on your PRO-MT 4x4

Traxxas 8654-GRAY Wheel Hubs Splined 17mm Typhon Parts They install as direct replacementsSplined 17mm wheel hubs with a gray anodized finish. Four per package, supplied with four 4x5mm grub screws and four 3x14mm pins. The hub is the interface between the axle and the wheel, and it carries every bit of drive torque through that splined connection. A worn or rounded hub lets the wheel move independently of the axle under load, which destroys both parts quickly once it starts. The pins and grub screws are included so you can fit them