[suicideneil]

Its all in the manual, but for the sake of plain english:

The hvmaxx esc (or any modern esc for that matter) will not send the motor from forwards to reverse without slowing it to a stop first, period (push full reverse on transitter). Once the truck has stopped moving (for about 2 seconds with the hvmaxx I believe), it will then allow you to use reverse- simply push the trigger to the reverse posistion again and hey-presto.

Its essentialy a safe-guard to prevent damage to the esc, motor and drivetrain of the truck- nothing like slamming it into reverse when you are doing 30+mph to kill your gears....