This rear transmission case is a replacement designed for the Serpent Mini Spyder Monster truck RTR EP (SER440001). It mounts to the chassis and locates the rear drivetrain components while keeping the spur and pinion aligned in rear assemblies.
Compatibility is shown with the Mini Spyder MT designation and the SER440001 RTR chassis reference; confirm fit to your chassis before installation. Use this part to replace a damaged rear case or to refresh an aged housing so correct gear mesh and alignment are restored.
Installation notes: remove the existing rear case and move original hardware and any bearings into the new housing, make sure mating faces are clean, and check gear alignment by slowly rotating the drivetrain before full reassembly. Avoid over-tightening bolts to prevent distortion of mounting faces that can lead to premature gear wear.
Service and tuning role: this component is mainly structural and influences gear alignment and drivetrain stiffness; fitting the correct rear case helps ensure consistent gear mesh, supporting steady power delivery and reducing uneven wear during regular use.
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