Traxxas Pinion 13-Tooth Rear RC Differential Gear - 7778

The Traxxas 7778 is a 13-tooth pinion gear for the rear differential, designed to work specifically with the Traxxas 42-tooth differential ring gear (part #7779) as a matched pair. As a genuine Traxxas spare part, TRX7778 is a direct replacement for worn or damaged drivetrain components and is machined to factory tolerances to maintain correct gear mesh and ratio in the differential assembly. If your rear diff is noisy, slipping, or suffering from drivetrain play, replacing the pinion gear alongside the ring gear restores proper function without the guesswork of aftermarket alternatives.

Key Features

• 13-tooth rear differential pinion gear engineered to pair with the Traxxas 42-tooth differential ring gear (#7779)
• Genuine Traxxas replacement part manufactured to OEM tolerances for accurate gear mesh and correct differential ratio
• Targeted solution for worn or damaged rear diff internals, restoring drivetrain performance to factory specification
• Sold as a single pinion gear — intended for use as part of a matched differential rebuild alongside #7779

Compatible With

• Must be used with Traxxas 42-tooth differential ring gear (part #7779)
• Compatibility with specific Traxxas vehicle models should be confirmed against the Traxxas parts finder or your vehicle's manual — refer to part number TRX7778

What's Included

• 1x Traxxas 13-tooth rear differential pinion gear (TRX7778)