What recline position should I use for rear-facing installation?
You must use only Recline Position #1 when the child restraint is in the rear-facing position. Never use Recline Position #2 or Recline Position #3 rear-facing. After adjusting, rock the child restraint back and forth to confirm it is securely locked in position. (Pages 9, 62)
From the official Evenflo Symphony All In One Car Seat manual, page 9
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