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This system adds the reverse feature to a Mammoth ST, and can only be used with the original 2-speed transmission that is supplied with the Mammoth ST. The reverse system can be used with a 3 channel radio or the stock 2 channel radio with the addition of the XTM R-Box electronic reverse mixer.
The reverse system comes with all the necessary hardware, braces, drivelines, and linkages. Add a third servo to complete the installation.