The Pro-BUILT 4X4 front differential comes professionally assembled for easy drop-in replacement. The sealed assembly comes 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. Includes 13-tooth pinion gear and 37-tooth ring gear. Pro-BUILT differentials are not directly compatible with Titan®-powered 4X4 models.
 
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