For those of you forgetting to swap gear or not knowing what gear is a higher item level than other stuff you have, this addon should help.
http://www.wowinterface.com/downloads/info14286-FLOPFlameLeviathanOPtimizer.html
QuoteFLOP, the Flame Leviathan OPtimizer, adds a slash command to optimize your gear for vehicular slaughter.
Despite the name, this addon is effective for all scaling vehicles, including those used for Flame Leviathan, Malygos, the Occulus, Wintergrasp, and Strand of the Ancients.
Usage:
/flop - Scans your equipped inventory and any available bags (including the bank) for the highest-level items you own, then equips those items (ignoring slots not counted by vehicles, such as the offhand and ranged slots). If FLOP has already equipped a set of gear in this manner, re-entering "/flop" will revert to the gear worn prior to FLOP's activation.