Traxxas Halves Front & Rear RC Gearbox - 3991X

The Traxxas TRX3991X gearbox halves kit is a genuine Traxxas spare parts set providing the front and rear gearbox housings along with the internal hardware needed to rebuild a damaged or worn transmission. Designed as a direct factory replacement, this kit includes the shift detent components and seals required to restore your gearbox to proper working order rather than replacing just a single worn piece. If your Traxxas transmission casing is cracked, stripped, or leaking, TRX3991X gives you the core structural parts to carry out a thorough rebuild.

Key Features

• Includes both front and rear gearbox halves, covering the full housing assembly in one purchase
• Shift detent ball and spring are included to maintain positive gear engagement after reassembly
• Pre-glued shift shaft seal reduces the risk of transmission fluid loss and contamination during use
• 4mm GS fastener and two 2.5x8mm CS screws are included, ensuring you have the correct hardware for reassembly
• Genuine Traxxas part — matched to factory tolerances for a precise fit

Compatible With

• Traxxas Jato 3.3
• Traxxas Rustler (check model-specific parts diagram for confirmation)
• Verify fitment using the Traxxas parts diagram for your specific model before ordering

What's Included

• Front gearbox half
• Rear gearbox half
• Shift detent ball
• Shift detent spring
• 4mm GS fastener
• Shift shaft seal (pre-glued)
• 2.5x8mm CS screws (x2)