The Factory Pro FP-O-XCP006 replacement main chassis is made for XRAY T4-21 models and includes two battery mount plates so you can test alternate battery layouts. It works as a direct replacement or as an upgrade to shift battery location and tune vehicle balance.
The part is supplied as the complete main chassis plate to swap with the original. When fitting, check servo, ESC, and motor mount alignments and inspect driveshaft and suspension pickup geometry before final tightening. Some small trimming of brackets or foam on the car may be required to clear the plates depending on the layout chosen.
Use the battery plates as a practical tuning method: moving the battery forward or aft adjusts front/rear weight split and transient response without changing suspension geometry. Always trial-fit to confirm compatibility before hitting the circuit.
For racers adjusting battery location on an XRAY T4-21, this Factory Pro chassis provides an accessible upgrade path and straightforward tuning options; ensure all clearances are checked before completing the installation.
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