This is a replacement Traxxas Differential Housing Set. This set includes the left and right side housing, as well as the pinion collar.
This product was added to our catalog on February 29, 2008
Tuesday, Mar 1 2022 (about a year ago)
Traxxas Differential Housing Set (E-Maxx)
This fit perfectly on my 3906; only difference was I had to go get a new pair of screws because the original on my truck only had two screws that ultimately held the housing together. All in all, worth the hassle because this new housing seems a good deal sturdier.