The Traxxas X-Maxx is a very big and very tough RC, simply put this thing is a beast. As people use the X-Maxx, it was found that some people were destroying Differential Gears. Traxxas listen to the consumer and have announced Machined Differential Gears. The gears are machined from hardened steel to add extra driveline strength. They are also spiral cut for extra shock load resistance. The new gears will slide right in with no modification required. MSRP is $45.00 for the rear, Part# 7778x and $45.00 for the front, Part# 7777x.
The parts are listed on the Traxxas site, but I am having a hard time find them in stores. I hope this isn’t another situation where Traxxas announces a new part and we get to wait upwards of a year before it is readily available.