The Tamiya #9803481 Lower Bulkhead is a direct replacement for the TRF421 chassis, delivering precise fit and alignment to keep suspension geometry spot on. It suits tuners who expect reliable, repeatable performance lap after lap.
Produced from quality materials, this lower bulkhead holds suspension mounts true under load and helps deliver predictable handling through corners. The design reduces unwanted flex during aggressive driving.
Fit the Tamiya #9803481 Lower Bulkhead when refreshing an older build or installing upgraded suspension components; it bolts into the TRF421 without chassis modification.
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