Always the correct part
Beach RC says... Traxxas Pro-BUILT differentials come professionally assembled for easy drop-in replacement.
The sealed assemblies come pre-filled with 30k-weight silicone oil with steel gears to withstand Velineon® brushless horsepower.
Pro-BUILT differentials are direct replacements for VXL 4X4 models (see full list below).
Note: Pro-BUILT differentials are not directly compatible with Titan®-powered 4X4 models.