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The 3977A is the original dual-motor gear cover set for the E-Maxx — upper and lower covers, a dust plug, and three 3×6 mm counter-sunk screws. This is a Legacy part — discontinued with no direct replacement. If you are converting your E-Maxx to a single brushless motor setup rather than replacing the stock dual-motor cover, see TRX-3977R (single motor gear cover, used with motor plate TRX-3997X).
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Fits Traxxas E-Maxx dual-motor configurations. Consult your vehicle’s manual or parts diagram to verify fitment before ordering.
Traxxas PN: 3977A · Retailer PN: TRA3977A · JackWagon SKU: TRX-3977A





